{"title":"Engine Blocks \u0026 Long Blocks","description":"\u003ch2\u003eChoosing the Right Block\u003c\/h2\u003e\n\u003cp\u003ePerformance engine blocks for LS swaps, and for Ford and Hemi builds, are not interchangeable commodities. The block you choose sets the ceiling for displacement, boost, and longevity. Get the bore, deck height, and material wrong and you're either leaving power on the table or rebuilding sooner than you planned.\u003c\/p\u003e\n\u003cp\u003eFour criteria drive the decision: whether you want a bare block or a long block assembly, cast iron or aluminium, what bore size and deck height you need, and which engine family your swap chassis is built around. Work through them in order and the field narrows quickly.\u003c\/p\u003e\n\u003ch3\u003eLong Block vs Bare Block\u003c\/h3\u003e\n\u003cp\u003eA long block arrives with the crankshaft, connecting rods, pistons, cylinder heads, and valvetrain already installed. The rotating assembly is balanced, the heads are torqued, and you're adding intake, exhaust, ignition, and ancillaries rather than building from scratch. For a builder who wants to compress the assembly phase or who doesn't have access to an engine stand and a dial bore gauge, a long block is the practical choice.\u003c\/p\u003e\n\u003cp\u003eA bare block gives you a precision casting and nothing else. You specify every internal component, crank stroke, rod ratio, piston compression height, head combination, and you or your engine builder assemble it. That flexibility matters when you're chasing a specific displacement target, running a non-standard bore, or sourcing components from a preferred supplier. Most of the blocks in this collection are bare castings.\u003c\/p\u003e\n\u003ch3\u003eMaterial: Cast Iron vs Aluminium\u003c\/h3\u003e\n\u003cp\u003eCast iron is heavier, cheaper, and more forgiving under heat cycles. The thermal mass helps stabilise combustion temperatures on long pulls, and the material tolerates detonation better before showing damage. For a budget street build or a truck application where weight isn't a concern, cast iron is a sensible choice. The Dart LS Next iron blocks and the Chevrolet Performance LSX castings are both cast iron.\u003c\/p\u003e\n\u003cp\u003eAluminium saves meaningful weight, typically 40 to 50 lb over a comparable iron block, and dissipates heat faster, which can be an advantage in a tightly packaged engine bay. The trade-off is cost: aluminium aftermarket blocks carry a premium, and they require closer attention to coolant chemistry and head gasket selection to prevent galvanic corrosion. For a swap build where front axle weight matters, or for a track car where every kilogram counts, the aluminium Dart LS Next variants are worth the additional outlay.\u003c\/p\u003e\n\u003cp\u003eOn forced induction, both materials can handle serious cylinder pressure if the block is engineered for it. The question is less iron vs aluminium and more whether the casting is designed for boost, four-bolt or cross-bolted main caps, thicker cylinder walls, reinforced oil galleys.\u003c\/p\u003e\n\u003ch3\u003eBore Size and Deck Height\u003c\/h3\u003e\n\u003cp\u003eBore and deck height determine displacement ceiling and stroker compatibility. A 4.000-inch bore with a 9.240-inch deck on a standard LS journal crankshaft produces approximately 364 cubic inches (6.0 litres). Stepping up to a 4.125-inch bore with the same deck and a stroker crank opens the door to 427 or larger. The 9.450-inch tall-deck iron block takes that further still, accommodating longer-stroke assemblies that wouldn't clear the pan rails on a standard-deck block.\u003c\/p\u003e\n\u003cp\u003eFor forced-induction LS builds, bore size interacts with rod-to-stroke ratio and piston design. A larger bore gives more swept area but requires careful matching with the head's quench and combustion chamber geometry. If you're planning boost above 15 psi, the block's bore needs to be matched to forged pistons with appropriate ring packs, not the stock cast items.\u003c\/p\u003e\n\u003cp\u003eDeck height also determines which cylinder heads will seal correctly. All standard LS Next 9.240-inch deck blocks accept standard LS-generation head gaskets. The 9.450-inch tall-deck variant requires tall-deck-specific gaskets and intake manifolds. Confirm before ordering heads.\u003c\/p\u003e\n\u003ch3\u003eBlock Family and Platform Fitment\u003c\/h3\u003e\n\u003cp\u003eThe LS and LT families dominate this collection, and with good reason, they fit more swap applications than any other American V8. The engine mounts, transmission bellhousing patterns, and oil pan configurations are well-documented for almost every common UK swap chassis. Dart's LS Next series is dimensionally compatible with the standard Gen III\/IV LS envelope: same bellhousing bolt pattern, same motor mount ears, same oil pan rail geometry.\u003c\/p\u003e\n\u003cp\u003eThe Ford Performance Godzilla block (7.3 V8, M-6010-SD73) is a separate ecosystem entirely. It serves Ford builders, classic Escorts, Transits with a sense of humour, or American muscle projects that stay in the Blue Oval family. It does not share bellhousing or accessory patterns with the GM LS family.\u003c\/p\u003e\n\u003cp\u003eThe Dart Gen III Hemi VVT block serves Mopar builds. The 4.090-inch bore and 9.285-inch deck height accommodate large-displacement stroker assemblies for Hemi swaps, and the VVT-compatible architecture keeps options open for variable-valve-timing head combinations.\u003c\/p\u003e\n\u003ch2\u003eWhere the Criteria Conflict\u003c\/h2\u003e\n\u003cp\u003eThe decision points pull against each other in a few ways worth knowing upfront.\u003c\/p\u003e\n\u003cp\u003eA long block saves assembly time but removes most of the customisation decisions that a bare block leaves open. If you want a specific camshaft, a particular rod ratio, or a head combination that doesn't match what the long block ships with, you're pulling it apart before it goes in the car. Bare blocks take longer but they're built to your specification.\u003c\/p\u003e\n\u003cp\u003eAluminium blocks cost more to buy and more to repair if something goes wrong. A cracked iron block can often be sleeved or welded; an aluminium casting with a compromised bore is typically scrap. Budget accordingly.\u003c\/p\u003e\n\u003cp\u003eStroker-compatible blocks, those with taller decks or relieved skirts, cost more than standard-deck versions. If your current build plan calls for a 383 or a 408, the additional outlay on a stroker-friendly block is worthwhile. If you're building a naturally aspirated 364 that will stay there, a standard 9.240-inch deck block with a 4.000-inch bore is the correct choice and you're not paying for headroom you won't use.\u003c\/p\u003e\n\u003ch2\u003eWhich Block to Choose\u003c\/h2\u003e\n\u003cp\u003eStreet LS swap on a budget, naturally aspirated: a Dart LS Next iron block at 4.000-inch bore and 9.240-inch deck gives you a proven aftermarket casting with standard LS fitment. Pair it with a factory-spec crank and a set of hypereutectic or forged pistons depending on compression target.\u003c\/p\u003e\n\u003cp\u003eForced-induction LS build, street or track: move to a Dart SHP (Super High Performance) block. The additional reinforcement, thicker main webs, four-bolt mains with ARP hardware, is there for a reason. The SHP designation is not marketing; it reflects a different casting specification.\u003c\/p\u003e\n\u003cp\u003eWeight-sensitive street or track build: aluminium Dart LS Next variants shave weight without sacrificing the aftermarket-engineered wall thickness and main cap architecture that bare OEM blocks lack.\u003c\/p\u003e\n\u003cp\u003eFactory-reliability LT build: the Chevrolet Performance LT1\/LT4 replacement block is the right tool. OEM dimensional tolerances, no custom machine work required, and it accepts standard LT-generation components without modification.\u003c\/p\u003e\n\u003cp\u003eFord or Mopar project: the Ford Performance Godzilla block and the Dart Gen III Hemi block are their respective platform choices. Neither is a substitute for the other, and neither fits an LS swap chassis.\u003c\/p\u003e\n\u003ch2\u003eTop Picks\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/billysspeedshop.com\/products\/dart-shp-ls-next-pro-block-9-240-deck-4-00-bore-arp-main-studs\"\u003eDart SHP LS Next Pro Block, 9.240-inch deck, 4.000-inch bore, ARP main studs\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SHP designation indicates a higher-specification casting than the standard LS Next: reinforced main webs, four-bolt main caps, and ARP main studs already fitted. The 9.240-inch deck and 4.000-inch bore sit in the standard LS envelope, which means it drops into any chassis where a Gen III LS would go. This is the block for a forced-induction LS build, street or strip, where you want to build the rotating assembly to your own spec. Not the cheapest entry point, but the engineering justifies it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/billysspeedshop.com\/products\/dart-ls-next-aluminum-block-4-000-bore-skirted-31947111\"\u003eDart LS Next Aluminium Block, 4.000-inch bore, skirted (31947111)\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAluminium construction, standard 9.240-inch deck, skirted design. Lighter than the iron equivalent and packaged cleanly for engine-bay fitment. Works with standard LS crankshaft and connecting rod combinations up to mild stroker specifications. A sensible choice for a naturally aspirated or lightly boosted street build where front axle weight matters. Budget more carefully for head gaskets and coolant, aluminium requires closer attention than iron.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/billysspeedshop.com\/products\/chevrolet-performance-lt1-lt4-engine-block-replaces-19329617-19431901\"\u003eChevrolet Performance LT1\/LT4 Engine Block\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFactory OEM replacement casting from Chevrolet Performance, covering LT1 and LT4 applications. Accepts standard LT-generation components without modification. The right choice for a builder restoring or replacing an existing LT-family engine rather than building a custom stroker. OEM dimensional control means no surprises when you start fitting heads and mains. Not the block to choose if you're planning to depart significantly from factory displacement or boost targets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/billysspeedshop.com\/products\/ford-performance-godzilla-engine-block-m-6010-sd73\"\u003eFord Performance Godzilla Engine Block (M-6010-SD73)\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFord's 7.3-litre V8 block in performance-spec casting. Separate ecosystem from the GM LS family, different bellhousing pattern, different accessory architecture, different head bolt pattern. For Ford builders who want serious displacement without leaving the Blue Oval, this is the block. Pair it with Ford Performance rotating assembly and cylinder head components. Check your swap chassis for clearance; the 7.3 is a large engine by modern standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/billysspeedshop.com\/products\/dart-gen-iii-hemi-vvt-engine-block-4-090-bore-9-285-deck-height-31622221\"\u003eDart Gen III Hemi VVT Engine Block, 4.090-inch bore, 9.285-inch deck\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor Hemi swap builds. The 4.090-inch bore and 9.285-inch deck height accommodate large-displacement stroker assemblies, and the VVT-compatible architecture preserves the option of variable-valve-timing heads. The Hemi block pattern does not cross over to LS or Ford applications. If your project runs Mopar, this is the aftermarket casting to build around.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch2\u003eWhat's the difference between a long block and a bare block?\u003c\/h2\u003e\n\u003cp\u003eA long block includes the crankshaft, connecting rods, pistons, cylinder heads, and valvetrain pre-installed as a balanced assembly. You add the intake, exhaust, ignition system, and ancillaries. A bare block is a precision casting only, no rotating assembly, no heads. Bare blocks give you full control over every internal specification; long blocks compress the build timeline at the cost of customisation flexibility.\u003c\/p\u003e\n\u003ch2\u003eWill a Dart LS Next block fit my LS swap chassis?\u003c\/h2\u003e\n\u003cp\u003eYes, provided the chassis is set up for a standard Gen III or Gen IV LS. Dart LS Next blocks maintain the standard LS bellhousing bolt pattern, motor mount ear positions, and oil pan rail geometry. If your swap kit was designed around a production LS engine, the LS Next drops in using the same mounts and transmission. Confirm the oil pan configuration for your specific chassis before ordering, front-sump and rear-sump pans are not interchangeable.\u003c\/p\u003e\n\u003ch2\u003eCan I use an aluminium block on a forced-induction build?\u003c\/h2\u003e\n\u003cp\u003eYes, provided the casting is engineered for boost. The deciding factor is not material, it's whether the block has adequate main cap clamping, cylinder wall thickness, and oiling provision for the power level you're targeting. The Dart SHP LS Next blocks, available in both iron and aluminium, are specifically designed for high-horsepower and forced-induction applications. Standard OEM aluminium castings are a different matter; their wall thickness and main web design were not specified for sustained high-boost cylinder pressures.\u003c\/p\u003e\n\u003ch2\u003eWhat do bore size and deck height actually determine?\u003c\/h2\u003e\n\u003cp\u003eBore size is the cylinder diameter; deck height is the distance from the crankshaft centreline to the block deck surface. Together they define the maximum displacement the block can produce for a given crankshaft stroke. A larger bore increases swept area. A taller deck allows a longer stroke without the piston crowning above the deck or the connecting rod fouling the pan rail. If you're building a stroker, confirm that your chosen crank stroke, rod length, and piston compression height work together within the block's deck height.\u003c\/p\u003e\n\u003ch2\u003eAre these blocks pre-honed or do they need machine work before assembly?\u003c\/h2\u003e\n\u003cp\u003eIt varies by part number. Some Chevrolet Performance LSX castings are production-finished and honed to a specific bore diameter, ready for piston fitting after a light plateau hone. Most Dart blocks are supplied as raw or semi-finished castings requiring final bore and hone to the piston manufacturer's specified clearance. Check the product specification before sending to your machine shop, ordering a block that's already at final bore diameter and then boring it further is not recoverable.\u003c\/p\u003e\n\u003ch2\u003eCan I run a stroker crank in a standard 9.240-inch deck block?\u003c\/h2\u003e\n\u003cp\u003eDepends on the stroke. A 4-inch stroke in a standard 9.240-inch deck LS block works with appropriate rod length and piston compression height. A 4.125-inch stroke at the same deck height requires careful checking of rod-to-wall clearance and piston-to-head clearance. Longer strokes, typically anything beyond 4.125 inches in an LS, generally benefit from a taller deck. The Dart LS Next 9.450-inch tall-deck iron block exists for this reason. Establish your displacement target first, then select deck height to suit the stroke, not the other way around.\u003c\/p\u003e","products":[{"product_id":"lsx454-4-185-bore-production-finished-and-honed-4-185-bowtie-block-19417353","title":"LSX454 4,185 boring, færdiggjort og slebet 4,185\" bowtie-blok 19417353","description":"LSX BOWTIE BLOCK. LSX Bowtie Block er den næste revolution inden for højtydende motorbygning, der leverer den tilsyneladende umulige kombination af professionel racerstyrke og overkommelige priser på begynderniveau.\u003cbr\u003e\u003cbr\u003e\u003cp\u003e Chevrolet Performance 19260099 - LSX Færdiggjort og finpudset 4.185\" Bowtie Bare Block\u003c\/p\u003e\n\n\n\u003cp\u003e LSX Bowtie-motorblokken fremviser tre store forbedringer\u003c\/p\u003e\n\n\n\u003cp\u003e 1. Ekstra støtte på dækoverfladen.\u003c\/p\u003e\n\n\n\u003cp\u003e 2. Materialestyrke: 400 mPa trækstyrke, sammenlignet med de tidligere tilbudte 250 mPa. Materiale: Jern, G4000 med molybdæn\u003c\/p\u003e\n\n\n\u003cp\u003e 3. Ringformet udskæring i knastlejets overflade i blokken for forbedret placering af olietilførsel. Dette gør det muligt at placere olietilførselshullet i klokken tre-positionen i stedet for klokken seks-positionen.\u003c\/p\u003e\n\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003cp\u003e Blok som brugt i LSX454 \u0026amp; LSX454R kassemotor\u003c\/p\u003e","brand":"Chevrolet","offers":[{"title":"Default Title","offer_id":50548710998310,"sku":"lsx454-4-185-bore-production-finished-and-honed-4-185-bowtie-block-19417353","price":4192.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/19417353.jpg?v=1757081050"},{"product_id":"lsx454-4-185-bore-production-finished-and-honed-4-185-quot-bowtie-block-19417353","title":"LSX454 4,185 boring, færdiggjort og slebet 4,185\" bowtie-blok 19417353","description":"\u003cp\u003e Chevrolet Performance 19260099 - LSX Færdiggjort og finpudset 4.185\" Bowtie Bare Block\u003c\/p\u003e\n\n \u003cp\u003eLSX Bowtie-motorblokken fremviser tre store forbedringer\u003c\/p\u003e\n\n\u003cp\u003e 1. Ekstra støtte på dækoverfladen.\u003c\/p\u003e\n\n\u003cp\u003e 2. Materialestyrke: 400 mPa trækstyrke, sammenlignet med de tidligere tilbudte 250 mPa. Materiale: Jern, G4000 med molybdæn\u003c\/p\u003e\n\n\u003cp\u003e 3. Ringformet udskæring i knastlejets overflade i blokken for forbedret placering af olietilførsel. Dette gør det muligt at placere olietilførselshullet i klokken tre-positionen i stedet for klokken seks-positionen.\u003c\/p\u003e\n\n\u003cp\u003e Blok som brugt i LSX454 \u0026amp; LSX454R kassemotor\u003c\/p\u003e","brand":"Chevrolet","offers":[{"title":"Default Title","offer_id":50548711162150,"sku":"lsx454-4-185-bore-production-finished-and-honed-4-185-quot-bowtie-block-19417353","price":4299.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/19417353_c49309a7-5cdb-4377-8a36-515fd0078c49.jpg?v=1757081050"},{"product_id":"chevrolet-performance-9-720-tall-deck-lsx-block-19417354","title":"Chevrolet Performance 9.720\" Tall Deck LSX Block","description":"\u003ctable class=\"features-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlock Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGM LS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUNFINISHED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDeck Height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9.720\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCast Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEngine Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041510289702,"sku":"19417354","price":4199.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/nal-19417354_lu_xl.jpg?v=1770810108"},{"product_id":"chevrolet-performance-engine-block-lsa-aluminum-12673476","title":"Chevrolet Performance Engine Block - LSA - Aluminum","description":"\u003cp\u003eThe LS-Series cylinder block is the foundation for the serious performance achievements that are driving a new generation of street and racing enthusiasts. Features include a deep-skirt casting (the block side extends below the crankshaft centerline); 6-bolt cross-bolted main caps, strong and lightweight aluminum alloy casting (most production blocks) and provisions for the latest in engine control management. The cam-in-block configuration brings inherent torque to every LS engine, with production-based blocks capable of supporting combinations of 500 horsepower or more. The Corvette ZR1’s unique 6.2L block, for example, supports the engine’s 638-horsepower rating. Chevrolet Performance’s high-performance iron LSX cylinder block supports more than 2,000 forced-induction horses!\u003c\/p\u003e\n\n\u003cp\u003eWhether you’re building a mild street engine or an Outlaw racing engine, starting with a strong LS cylinder block brings the assurance that you’ll make the power you need with a durable foundation.\u003c\/p\u003e\n\n\u003cp\u003eLSA 6.2L Bare Block\u003cbr\u003e\n• Direct replacement for 2009-2012 Cadillac CTS-V 6.2L supercharged engine and 2012 ZL1 Camaro\u003cbr\u003e\n• Production cast-aluminum block with iron sleeves\u003cbr\u003e\n• Production oiling system\u003cbr\u003e\n• 6-bolt iron main bearing caps\u003cbr\u003e\n• 9.240\" deck height\u003cbr\u003e\n• Not for use with LS7 or LSX-LS7 heads\u003cbr\u003e\n• 4.065\" finished bore (103.25mm)\u003cbr\u003e\n• Includes oil squirters (8) for piston cooling\u003cbr\u003e\n• No provision for active fuel management\u003cbr\u003e\n• Rated for more than 550 horsepower\u003c\/p\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041513566502,"sku":"12673476","price":3099.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_12673476_50.jpg?v=1770809988"},{"product_id":"chevrolet-performance-engine-block-lsx-9-260-deck-3-880-bore-19417351","title":"Chevrolet Performance Engine Block - LSX - 9.260\" Deck - 3.880\" Bore","description":"\u003cp\u003eCHEVROLET PERFORMANCE ENGINE BLOCK - LSX - 9.260\" DECK - 3.880\" BORE - 19417351\u003cbr\u003e\nChevrolet Performance LSX Bowtie engine blocks have been designed for the advanced competition engine builder. They feature Siamese cylinder bores and a semi-finished deck height. The Chevrolet Performance LSX Bowtie engine blocks can accept a maximum stroke of 4.250 in., a maximum bore of 4.250 in., and they can support displacements of 454 cu. in. or more. The blocks feature cast iron construction with a powdercoated orange finish. They accept all Gen III and IV LS-style cylinder heads, crankshafts, camshafts, and other components. \u003cbr\u003e\n \u003cbr\u003e\n Additional features of the Chevrolet Performance Parts LSX Bowtie engine blocks include:\u003cbr\u003e\n \u003cbr\u003e\n \u003cbr\u003e\n • Front oil feed lines that can be plugged or restricted for mechanical flat tappet or mechanical lifter applications\u003cbr\u003e\n • Can be safely machined to 9.200 in. deck height\u003cbr\u003e\n • 1054 Billet Steel 6-bolt main bearing caps\u003cbr\u003e\n • 6-bolt cylinder head bolt pattern\u003cbr\u003e\n • Cam bores that can be machined to accept 60mm roller bearings\u003cbr\u003e\n • Can be machined for larger diameter lifters\u003cbr\u003e\n • External oil pump feed at the rear\u003cbr\u003e\n • Added 7th transmission bolt hole to work with early-style GM transmissions\u003cbr\u003e\n • Can accept a front motor plate for racing use\u003cbr\u003e\n • Threaded freeze plugs that can be used for external heaters or coolers\u003c\/p\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041513599270,"sku":"19417351","price":4902.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_19260093_51_0683986c-3631-4931-aa4e-04bb97ff5cd5.jpg?v=1770810106"},{"product_id":"chevrolet-performance-engine-block-lsx454-9-240-deck-4-185-bore-19417353","title":"Chevrolet Performance Engine Block - Lsx454 - 9.240\" Deck - 4.185\" Bore","description":"\u003cp\u003eGM Performance LSX 454 Block 9.240\" Deck 4.185\" Bore Part# 19417353\u003cbr\u003e\nThese GM Performance LSX Bowtie engine blocks have been designed for the advanced competition engine builder. They feature Siamese cylinder bores and a semi-finished deck height. The Chevrolet Performance LSX Bowtie engine blocks can accept a maximum stroke of 4.250 in., a maximum bore of 4.250 in., and they can support displacements of 454 cu. in. or more. The blocks feature cast iron construction with a powdercoated orange finish. They accept all Gen III and IV LS-style cylinder heads, crankshafts, camshafts, and other components.\u003cbr\u003e\nAdditional features of the Chevrolet Performance Parts LSX Bowtie engine blocks include:\u003cbr\u003e\n* Front oil feed lines that can be plugged or restricted for mechanical flat tappet or mechanical lifter applications\u003cbr\u003e\n* Can be safely machined to 9.200 in. deck height\u003cbr\u003e\n* 1054 Billet Steel 6-bolt main bearing caps\u003cbr\u003e\n* 6-bolt cylinder head bolt pattern\u003cbr\u003e\n* Cam bores that can be machined to accept 60mm roller bearings\u003cbr\u003e\n* Can be machined for larger diameter lifters\u003cbr\u003e\n* External oil pump feed at the rear\u003cbr\u003e\n* Added 7th transmission bolt hole to work with early-style GM transmissions\u003cbr\u003e\n* Can accept a front motor plate for racing use\u003cbr\u003e\n* Threaded freeze plugs that can be used for external heaters or coolers\u003cbr\u003e\n* Windowed main bulkhead\u003c\/p\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041513632038,"sku":"19417353","price":5013.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_19260099_54.jpg?v=1770810107"},{"product_id":"chevrolet-performance-l8t-engine-block-19436495","title":"Chevrolet Performance L8T Engine Block","description":"\u003ctable class=\"features-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlock Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGM GEN V LT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDeck Height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9.240\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCast Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEngine Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041517695270,"sku":"19436495","price":2458.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/f144864012.jpg?v=1770810113"},{"product_id":"chevrolet-performance-lt1-lt4-engine-block-replaces-19329617-19431901","title":"Chevrolet Performance LT1\/LT4 Engine Block - Replaces 19329617","description":"\u003ctable class=\"features-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlock Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGM GEN V LT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEngine Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52041519464742,"sku":"19431901","price":2993.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_19329617_45_1.jpg?v=1770810112"},{"product_id":"dart-engine-block-ls-next-9-240-deck-4-000-bore-aluminum-31937111","title":"Dart Engine Block - LS Next - 9.240\" Deck - 4.000\" Bore - Aluminum","description":"\u003cp\u003eDART ENGINE BLOCK - LS NEXT - 9.240\" DECK - 4.000\" BORE - ALUMINUM - 31937111\u003cbr\u003e\nDart LS Next aluminum bare blocks are designed from a clean slate approach. They integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. By utilizing conventional style main caps and oil pans with LS rotating assemblies and related components, Dart has addressed the LS engine's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for both the Gen III and IV platforms. Dart LS Next aluminum bare blocks are a real game-changer!\u003cbr\u003e\n \u003cbr\u003e\n Highlight features of the LS Next aluminum bare blocks are: \u003cbr\u003e\n \u003cbr\u003e\n • Cast from premium aluminum alloy \u003cbr\u003e\n • One-piece rear main seal design\u003cbr\u003e\n • Conventional style 4-bolt steel main caps \u003cbr\u003e\n • Available in deck heights from 9.240 in., 9.450 in., and up to 9.800 in. \u003cbr\u003e\n • Extra-thick decks ensure reliable head gasket seal\u003cbr\u003e\n • Blind head holes available in 7\/16 in. or 1\/2 in. \u003cbr\u003e\n • Scalloped water jackets increase flow around cylinders for better cooling\u003cbr\u003e\n • Clearance for 4.100 in. stroke with steel rods\u003cbr\u003e\n • Must be clearanced for fully counterweighted crankshafts\u003cbr\u003e\n • Splayed outer bolts on middle main bearing caps\u003cbr\u003e\n • Provisions for OE stock roller lifters and cam\u003cbr\u003e\n • Uses stock timing covers and stock rear cover\u003cbr\u003e\n • All OE holes for starter water pump, etc.\u003cbr\u003e\n • Skirted and non-skirted design available\u003cbr\u003e\n • Driver or passenger side starter mounts (not available on skirted version)\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546334502,"sku":"31937111","price":7249.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31937111_24.jpg?v=1770810269"},{"product_id":"dart-engine-block-ls-next-9-240-deck-4-000-bore-finish-honed-iron-31867111","title":"Dart Engine Block - LS Next - 9.240\" Deck - 4.000\" Bore - Finish Honed - Iron","description":"\u003cp\u003eDART ENGINE BLOCK - LS NEXT - 9.240\" DECK - 4.000\" BORE - FINISH HONED - IRON - 31867111\u003cbr\u003e\nDart LS Next cast iron bare blocks integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. The blocks are designed to rectify some of the former LS's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for Gen III and IV platforms. They're available in multiple engine block styles, including stock\/OEM standard deck and aftermarket. Dart LS Next blocks are back and better than ever!\u003cbr\u003e\n \u003cbr\u003e\n Highlight features of the LS Next cast iron bare blocks include: \u003cbr\u003e\n \u003cbr\u003e\n • Cast with premium cast iron alloy\u003cbr\u003e\n • Conventional style 4-bolt steel main caps \u003cbr\u003e\n • Full main webbing for maximum bottom-end strength\u003cbr\u003e\n • Extended cylinder barrels at the bottom to provide greater piston support for all combinations\u003cbr\u003e\n • Extra-thick Siamese cylinder bores \u003cbr\u003e\n • Blind head bolt holes don't go through into the water jacket\u003cbr\u003e\n • Provision for oil restrictors in the lifter valley\u003cbr\u003e\n • Revised low-restriction priority main oiling system\u003cbr\u003e\n • Pro-Stock\/Pro-Mod big block style stepped main oil galley\u003cbr\u003e\n • External oil filter (must be used with stock or aftermarket oil pumps)\u003cbr\u003e\n • Dual starter mounts\u003cbr\u003e\n • Expanded water jacket on #1 cylinder for additional cooling capacity\u003cbr\u003e\n • LSX-style lifter bosses and dog bone provision are provided\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546367270,"sku":"31867111","price":3999.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31867111_25.jpg?v=1770810267"},{"product_id":"dart-engine-block-ls-next-9-240-deck-4-000-bore-iron-31837111","title":"Dart Engine Block - LS Next - 9.240\" Deck - 4.000\" Bore - Iron","description":"\u003cp\u003eDART ENGINE BLOCK - LS NEXT - 9.240\" DECK - 4.000\" BORE - IRON - 31837111\u003cbr\u003e\nDart LS Next cast iron bare blocks integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. The blocks are designed to rectify some of the former LS's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for Gen III and IV platforms. They're available in multiple engine block styles, including stock\/OEM standard deck and aftermarket. Dart LS Next blocks are back and better than ever!\u003cbr\u003e\n \u003cbr\u003e\n Highlight features of the LS Next cast iron bare blocks include: \u003cbr\u003e\n \u003cbr\u003e\n • Cast with premium cast iron alloy\u003cbr\u003e\n • Conventional style 4-bolt steel main caps \u003cbr\u003e\n • Full main webbing for maximum bottom-end strength\u003cbr\u003e\n • Extended cylinder barrels at the bottom to provide greater piston support for all combinations\u003cbr\u003e\n • Extra-thick Siamese cylinder bores \u003cbr\u003e\n • Blind head bolt holes don't go through into the water jacket\u003cbr\u003e\n • Provision for oil restrictors in the lifter valley\u003cbr\u003e\n • Revised low-restriction priority main oiling system\u003cbr\u003e\n • Pro-Stock\/Pro-Mod big block style stepped main oil galley\u003cbr\u003e\n • External oil filter (must be used with stock or aftermarket oil pumps)\u003cbr\u003e\n • Dual starter mounts\u003cbr\u003e\n • Expanded water jacket on #1 cylinder for additional cooling capacity\u003cbr\u003e\n • LSX-style lifter bosses and dog bone provision are provided\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546400038,"sku":"31837111","price":4499.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31837111_26.jpg?v=1770810266"},{"product_id":"dart-engine-block-ls-next-9-240-deck-4-125-bore-deep-skirt-aluminum-31947211","title":"Dart Engine Block - LS Next - 9.240\" Deck - 4.125\" Bore - Deep Skirt - Aluminum","description":"\u003cp\u003eDART ENGINE BLOCK - LS NEXT - 9.240\" DECK - 4.125\" BORE - DEEP SKIRT - ALUMINUM - 31947211\u003cbr\u003e\nDart LS Next aluminum bare blocks are designed from a clean slate approach. They integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. By utilizing conventional style main caps and oil pans with LS rotating assemblies and related components, Dart has addressed the LS engine's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for both the Gen III and IV platforms. Dart LS Next aluminum bare blocks are a real game-changer!\u003cbr\u003e\n \u003cbr\u003e\n Highlight features of the LS Next aluminum bare blocks are: \u003cbr\u003e\n \u003cbr\u003e\n • Cast from premium aluminum alloy \u003cbr\u003e\n • One-piece rear main seal design\u003cbr\u003e\n • Conventional style 4-bolt steel main caps \u003cbr\u003e\n • Available in deck heights from 9.240 in., 9.450 in., and up to 9.800 in. \u003cbr\u003e\n • Extra-thick decks ensure reliable head gasket seal\u003cbr\u003e\n • Blind head holes available in 7\/16 in. or 1\/2 in. \u003cbr\u003e\n • Scalloped water jackets increase flow around cylinders for better cooling\u003cbr\u003e\n • Clearance for 4.100 in. stroke with steel rods\u003cbr\u003e\n • Must be clearanced for fully counterweighted crankshafts\u003cbr\u003e\n • Splayed outer bolts on middle main bearing caps\u003cbr\u003e\n • Provisions for OE stock roller lifters and cam\u003cbr\u003e\n • Uses stock timing covers and stock rear cover\u003cbr\u003e\n • All OE holes for starter water pump, etc.\u003cbr\u003e\n • Skirted and non-skirted design available\u003cbr\u003e\n • Driver or passenger side starter mounts (not available on skirted version)\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546432806,"sku":"31947211","price":7249.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31947211_27.jpg?v=1770810271"},{"product_id":"dart-engine-block-ls-next-9-450-deck-4-125-bore-iron-31837221","title":"Dart Engine Block - LS Next - 9.450\" Deck - 4.125\" Bore - Iron","description":"\u003cp\u003eDART ENGINE BLOCK - LS NEXT - 9.450\" DECK - 4.125\" BORE - IRON - 31837221\u003cbr\u003e\nDart LS Next cast iron bare blocks integrate the robust heritage of a traditional Chevy small block with the performance potential of the late model LS engine architecture. The blocks are designed to rectify some of the former LS's more noticeable shortcomings on the bottom end—while still supporting high-flow and efficient cylinder heads developed for Gen III and IV platforms. They're available in multiple engine block styles, including stock\/OEM standard deck and aftermarket. Dart LS Next blocks are back and better than ever!\u003cbr\u003e\n \u003cbr\u003e\n Highlight features of the LS Next cast iron bare blocks include: \u003cbr\u003e\n \u003cbr\u003e\n • Cast with premium cast iron alloy\u003cbr\u003e\n • Conventional style 4-bolt steel main caps \u003cbr\u003e\n • Full main webbing for maximum bottom-end strength\u003cbr\u003e\n • Extended cylinder barrels at the bottom to provide greater piston support for all combinations\u003cbr\u003e\n • Extra-thick Siamese cylinder bores \u003cbr\u003e\n • Blind head bolt holes don't go through into the water jacket\u003cbr\u003e\n • Provision for oil restrictors in the lifter valley\u003cbr\u003e\n • Revised low-restriction priority main oiling system\u003cbr\u003e\n • Pro-Stock\/Pro-Mod big block style stepped main oil galley\u003cbr\u003e\n • External oil filter (must be used with stock or aftermarket oil pumps)\u003cbr\u003e\n • Dual starter mounts\u003cbr\u003e\n • Expanded water jacket on #1 cylinder for additional cooling capacity\u003cbr\u003e\n • LSX-style lifter bosses and dog bone provision are provided\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546531110,"sku":"31837221","price":4499.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31837221_28.jpg?v=1770810267"},{"product_id":"dart-engine-block-shp-ls-next-pro-9-240-deck-4-125-bore-31867212","title":"Dart Engine Block - Shp LS Next PRO - 9.240\" Deck - 4.125\" Bore","description":"\u003cp\u003eDART ENGINE BLOCK - SHP LS NEXT PRO - 9.240\" DECK - 4.125\" BORE - 31867212\u003cbr\u003e\nDart SHP Special High Performance LS Next Pro cast iron bare blocks continue the evolution of their LS Next platform with superior strength. With full skirt designs, priority oiling systems, and other excellent features, these SHP LS Next Pro blocks are the perfect upgrades for your factory LS blocks, as well as ideal starting points for drag racers, circle track competitors, off-roaders, and high performance marine enthusiasts.\u003cbr\u003e\nDart SHP LS Next Pro cast iron bare blocks feature:\u003cbr\u003e\n* Superior strength 220 BHN cast iron\u003cbr\u003e\n* Steel 4-bolt main caps with upgraded ARP main studs\u003cbr\u003e\n* Lifter oil crossover with restrictor provision\u003cbr\u003e\n* 6-bolt per cylinder capability\u003cbr\u003e\n* 4.000 in. up to 4.185\u003cbr\u003e\n* Factory oil filter provision\u003cbr\u003e\n* 8-counterweight machining\u003cbr\u003e\n* Full skirt design\u003cbr\u003e\n* Priority main oiling\u003cbr\u003e\n* Siamese cylinder bores\u003cbr\u003e\n* Thick decks ensure reliable head gasket seal\u003cbr\u003e\nThis block has an UN-Finished bore size of 4.115\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041546629414,"sku":"31867212","price":4699.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/m2_31867212_29.jpg?v=1770810269"},{"product_id":"dart-gen-iii-hemi-vvt-engine-block-4-090-bore-9-285-deck-height-31622221","title":"Dart GEN III HEMI VVT Engine Block - 4.090\" Bore - 9.285\" Deck Height","description":"\u003cp\u003eDesigned from a clean slate approach the Iron Eagle block has addressed the shortcomings of the Hemi Gen 3 platform and is the ideal candidate for hot rodders, drag racers, time attack competitors, drifters, and high-performance street enthusiasts.\u003cbr\u003e\nBy utilizing conventional style main caps with Gen3 rotating assemblies and related components, Dart has addressed the windage and oil control problems along with revising the cooling and oiling passages for improved flow.\u003cbr\u003e\nFeatures:\u003cbr\u003e\nPriority main oiling system with two lifter crossovers and restrictor provisions\u003cbr\u003e\nSiamesed cylinder bores with extra thick walls\u003cbr\u003e\nExtra thick decks ensure reliable head gasket seal.\u003cbr\u003e\nScalloped water jackets increase flow around cylinders for better cooling\u003cbr\u003e\nClearance for 4.050\" stroke w\/ steel rods\u003cbr\u003e\nBillet steel 4 bolt main caps 1-5, center 3 main caps splayed\u003cbr\u003e\nMain studs standard\u003cbr\u003e\nGen 3 HEMI style motor mounts\u003cbr\u003e\nProvisions for OE stock roller lifters and cam\u003cbr\u003e\nUses stock timing covers\u003cbr\u003e\nAll OE bolt holes for starter, water pump, etc.\u003cbr\u003e\nDoes not include cam bearings\u003cbr\u003e\nSpecifications:\u003cbr\u003e\nMaterial: 220 BHN Cast Iron\u003cbr\u003e\nDeck Height: 9.285\"\u003cbr\u003e\nCylinder Bore: 4.090\"\u003cbr\u003e\nMain Bearings: Stock\u003cbr\u003e\nMain Caps: Billet Steel 4-Bolt 1-5\u003cbr\u003e\nCam Location: Stock\u003cbr\u003e\nLifter Bores: Stock 0.842\" Dia.\u003cbr\u003e\nFreeze Plugs: Press Fit\u003cbr\u003e\nRear Seal: Stock\u003cbr\u003e\nWeight vs OEM: +40lbs Est\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041547055398,"sku":"31622221","price":4610.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/dart.jpg?v=1770810265"},{"product_id":"dart-ls-next-aluminum-block-4-000-bore-skirted-31947111","title":"Dart LS Next Aluminum Block - 4.000\" Bore - Skirted","description":"\u003cp\u003eDART LS NEXT ALUMINUM BLOCK - 4.000\" BORE - SKIRTED - 31947111\u003cbr\u003e\nDesigned from a clean slate approach, the LS Next Aluminum block has addressed the shortcomings of the LS platform and is the ideal candidate for hot rodders, drag racers, circle track competitors, off-roaders, and high performance marine enthusiasts. Features Dart priority main oiling system with provisions for stock oil filter mounting. By utilizing conventional style main caps and oil pans with LS rotating assemblies and related components, Dart has addressed the windage and oil control problems which result from the factory LS engine’s separated crankcase bays.\u003cbr\u003e\nSkirted and non-skirted design options available; Priority main oiling system; Available in deck heights from 9.240in, 9.450in, 9.750in up to 9.800in; STD or raised .388in cam location; Cylinder barrel  extended .375in at the bottom; Extra thick decks ensure reliable head gasket seal; Blind head bolt holes available in 7\/16in or 1\/2in; Scalloped water jackets increase flow around cylinders for better cooling; Clearance for 4.100in stroke with steel rods; MUST BE clearanced for center counterweighted crankshafts; Splayed outer bolts on middle main bearing style motor mounts; Provisions for OE stock roller lifters and stock timing covers and stock rear cover; All OE bolt holes for starter, water pump, or passenger side starter mounts (Not available with skirted version); Parts kit included.\u003c\/p\u003e","brand":"Dart","offers":[{"title":"Default Title","offer_id":52041547252006,"sku":"31947111","price":7249.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/drt-31947111_xl.jpg?v=1770810270"},{"product_id":"dart-ls-next-aluminum-block-4-125-bore-cleveland-mains-1-2-studs-31947211-ww2","title":"Dart LS Next Aluminum Block - 4.125\" Bore - Cleveland Mains - 1\/2\" Studs","description":"\u003cp\u003eLS Next2 Aluminum Engine Block (Skirted)\u003cbr\u003e\nDart’s LS Next2 Aluminum Engine Block, in 9.240, 9.450, 9.750 deck heights, 4.000 or 4.125 bores. With Billet Steel main caps, 1\/2 in. studs, and machined for counterweighted crankshafts \u0026amp; 1\/2 in. head studs. 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