{"product_id":"mast-black-label-255cc-ls3-bare-cylinder-heads-sold-in-pairs-ch-lsx-600210","title":"Mast Black Label 255CC LS3 Bare Cylinder Heads - Sold in Pairs","description":"\u003cp\u003eMAST BLACK LABEL 255CC LS3 BARE CYLINDER HEADS - SOLD IN PAIRS - CH-LSX-600210\u003cbr\u003e\nThe Mast Motorsports cylinder head product line is completely manufactured from a raw casting to a finished cylinder head in the USA located in Nacogdoches Texas.\u003cbr\u003e\nMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality. When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market.\u003cbr\u003e\nFull Send, no compromises, no shortcuts, ever.\u003cbr\u003e\nDimensional Specs\u003cbr\u003e\nBore Size: 4.000\" (+)\u003cbr\u003e\nWeight: 28 lbs.\u003cbr\u003e\nIntake Valve Size: 2.165\"\u003cbr\u003e\nExhaust Valve Size: 1.600\"\u003cbr\u003e\nValve Stem Diameter: 5\/16\"\u003cbr\u003e\nValve Length: 5.450\"\u003cbr\u003e\nValve Angle: 11°\u003cbr\u003e\nValve Spring Pocket Diameter: 1.65\"\u003cbr\u003e\nValve Spring Install Height: 1.800\"\u003cbr\u003e\nHead Stud Size: .493\"\u003cbr\u003e\nValve Guide OD: .502\"\u003cbr\u003e\nValve Job Type: Newen CNC 5 Angle\u003cbr\u003e\nAir Flow \u0026amp; Performance Criteria\u003cbr\u003e\nIntake Max. Flow: 370 CFM @ 0.700\"\u003cbr\u003e\nExhaust Max. Flow: 243 CFM @ 0.700\"\u003cbr\u003e\nIntake Average Flow: 243 CFM\u003cbr\u003e\nExhaust Average Flow: 170 CFM\u003cbr\u003e\nIntake Seat Material: Ductile Iron\u003cbr\u003e\nIntake Port Volume: 255cc\u003cbr\u003e\nExhaust Port Volume: 106cc\u003cbr\u003e\nStandard Chamber Volume: 70cc\u003cbr\u003e\nPort Type: CNC\u003cbr\u003e\nMaterials\u003cbr\u003e\nCylinder Head Material: A356-T6 Aluminum\u003cbr\u003e\nIntake Valve Seat Material: Ductile Iron\u003cbr\u003e\nExhaust Valve Seat Material: Ductile Iron\u003cbr\u003e\nDeck thickness: .750\"\u003cbr\u003e\nRocker Stand Type: Mast Billet\u003cbr\u003e\nRocker Arm Type: LS3 1.7 or Aftermarket\u003cbr\u003e\nGuide Material: Phosphor Bronze\u003cbr\u003e\nGeneral\u003cbr\u003e\nRocker Stand Type: Mast Billet\u003cbr\u003e\nRocker Stands Included: Yes\u003cbr\u003e\nRocker Stand Dowels Included: Yes\u003cbr\u003e\nUses Stock Rocker Bolts: No\u003cbr\u003e\nRocker Bolts Included: No\u003cbr\u003e\nRocker Arm Type: LS3 1.7 or Aftermarket\u003cbr\u003e\nHead Bolt QTY: 6 Bolt Style\u003cbr\u003e\nValve Cover Rail Height: + ½ inch\u003cbr\u003e\nCan use OE Valve Cover: Yes\u003c\/p\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":52041654632742,"sku":"CH-LSX-600210","price":3849.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/mml-chlsx600188_xl.jpg?v=1770811730","url":"https:\/\/billysspeedshop.com\/products\/mast-black-label-255cc-ls3-bare-cylinder-heads-sold-in-pairs-ch-lsx-600210","provider":"Billys Speed Shop","version":"1.0","type":"link"}