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Holley UK – Carburetors, EFI Systems & Performance Parts Holley is a legendary name in the world of performance. Since 1903, Holley has been at the forefront of fuelling technology, powering everything from classic hot rods to modern race cars....
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Holley EFI 558-306
Holley EFI Universal Unterminated Ignition Harness
Universal Unterminated Ignition Harness for HP EFI &...
Part TypeIgnition Harness£193.00£190.00 inc VAT£158.33 ex VAT -
Holley EFI 558-305
Holley EFI Ford TFI Ignition Harness
Ford TFI Ignition Harness for Avenger EFI, HP...
Part TypeIgnition Harness£139.99 inc VAT£116.66 ex VAT -
Holley EFI 558-304
Holley EFI HEI GM Small Cap Ignition Harness
HEI Ignition Harness for Avenger EFI, HP EFI...
Part TypeIgnition Harness£67.99 inc VAT£56.66 ex VAT -
Holley EFI 558-302
Holley EFI Tach Input Ignition Adapter
Plugs into the connector labeled “IGNITION” on the...
Part TypeIgnition Harness£26.99 inc VAT£22.49 ex VAT -
Holley EFI 558-221
Holley EFI GM GEN V GDI Sub Harness - Late LTx Engines
Late LTx Engines
Part TypeFuel Injection Harness£155.99 inc VAT£129.99 ex VAT -
Holley EFI 558-220
Holley EFI GM GEN V GDI Sub Harness
For Early LTx Engines
Part TypeFuel Injection Harness£157.99 inc VAT£131.66 ex VAT -
Holley EFI 558-219
Holley EFI Injector Driver Harness - Plug and Play with Dominator ECU
Plug and Play with Dominator ECU
Part TypeFuel Injection Harness£328.00£299.99 inc VAT£249.99 ex VAT -
Holley EFI 558-216
Holley EFI EV6 Unterminated Injector Harness Kit
EV6 Unterminated Injector Harness Kit
Part TypeFuel Injection Harness£157.99£155.99 inc VAT£129.99 ex VAT -
Holley EFI 558-214
Holley EFI INJECTOR HARNESS - EARLY TRUCK
LS MULTEC 2 INJECTOR HARNESS - EARLY TRUCK
Part TypeFuel Injection Harness£289.00£263.99 inc VAT£219.99 ex VAT -
Holley EFI 558-213
Holley EFI Ford V8 Injector Harness
Evenly spaced Ford V8 Injector Harness for Jetronic...
Part TypeFuel Injection Harness£209.99£197.99 inc VAT£164.99 ex VAT -
Holley EFI 558-212
Holley EFI Ford V8 Injector Harness
Evenly spaced Ford V8 Injector Harness for USCAR...
Part TypeFuel Injection Harness£205.00£193.99 inc VAT£161.66 ex VAT -
Holley EFI 558-211
Gen III HEMI V8 Injector Harness - Bosch/Jetronic and Holley injectors
The HEMI's Variable Valve Timing is not supported...
Part TypeFuel Injection Harness£196.99£193.99 inc VAT£161.66 ex VAT -
Holley EFI 558-210
Holley EFI Gen III HEMI V8 Injector Harness - Stock/USCAR style injectors
The HEMI's Variable Valve Timing is not supported...
Part TypeFuel Injection Harness£205.00£199.99 inc VAT£166.66 ex VAT -
Holley EFI 558-209
Holley EFI Ford V8 Injector Harness
Ford V8 Injector Harness for HP EFI &...
Part TypeFuel Injection Harness£262.00£250.00 inc VAT£208.33 ex VAT -
Holley EFI 558-207
Holley EFI Unterminated 16 Injectors MPFI Harness
Unterminated 16 injectors MPFI harness Terminated at injector...
Part TypeFuel Injection Harness£314.99£199.99 inc VAT£166.66 ex VAT -
Holley EFI 558-204
Holley EFI Universal Unterminated Injector Harness
Universal Unterminated Injector Harness for HP EFI &...
Part TypeFuel Injection Harness£236.99£226.00 inc VAT£188.33 ex VAT -
Holley EFI 558-203
Holley EFI Universal 6 Cylinder Injector Harness
Universal 6 Cylinder Injector Harness for HP EFI...
Part TypeFuel Injection Harness£223.99£212.99 inc VAT£177.49 ex VAT -
Holley EFI 558-201
Holley EFI LSx Injector Harness - For EV6 Style Injectors
LSx Injector Harness for HP EFI, Dominator EFI...
Part TypeFuel Injection Harness£187.99£185.99 inc VAT£154.99 ex VAT -
Holley EFI 558-200
Holley EFI V8 over Manifold, Bosch Style Injector Harness
V8 over Manifold, Bosch Style Connector Harness for...
Part TypeFuel Injection Harness£209.99£203.99 inc VAT£169.99 ex VAT -
Holley EFI 558-141
Holley EFI Ford 7.3L Godzilla Main Harness for Smart Coils
Requires Holley P/N 558-474 for proper operation with...
Part TypeFuel Injection Harness£523.99£365.99 inc VAT£304.99 ex VAT -
Holley EFI 558-140
Holley EFI Ford 7.3L Godzilla Main Harness for Stock Coils - Includes VVT and Oil Pump Connectors
Requires Holley P/N 558-474 for proper operation with...
Part TypeFuel Injection Harness£511.99£428.99 inc VAT£357.49 ex VAT -
Holley EFI 558-134
Holley EFI LS2/3/7+ (58x/4x) Engine Main Harness - Extended Length
For Dominator, HP, Terminator X and Terminator X...
Part TypeEngine Wiring Harness£706.00£655.99 inc VAT£546.66 ex VAT -
Holley EFI 558-133
Holley EFI LS1/6 (24x/1x) Engine Main Harness - Extended Length
For Dominator, HP, Terminator X and Terminator X...
Part TypeEngine Wiring Harness£706.00£655.99 inc VAT£546.66 ex VAT -
Holley EFI 558-132
Holley EFI GEN III HEMI VVT and SRV Harness - Use with Terminator X or Terminator X Max Only
Requires Terminator X Firmware and Software V2 Build...
Part TypeFuel Injection Wiring Harness Adapter£176.99 inc VAT£147.49 ex VAT -
Holley EFI 558-131
Holley EFI GEN III HEMI VVT Harness - Use with Terminator X or Terminator X Max Only
Requires Terminator X Firmware and Software V2 Build...
Part TypeFuel Injection Wiring Harness Adapter£142.99 inc VAT£119.16 ex VAT
Holley UK – Carburetors, EFI Systems & Performance Parts
Holley is a legendary name in the world of performance. Since 1903, Holley has been at the forefront of fuelling technology, powering everything from classic hot rods to modern race cars. Known for their carburetors, EFI systems, fuel pumps, and complete performance solutions, Holley remains the first choice for enthusiasts worldwide.
The Holley Legacy
Holley carburetors became an icon in American muscle cars and motorsport, appearing on millions of vehicles over the decades. Today, Holley’s reach extends far beyond carburetion, with a massive catalogue that includes EFI systems, intake manifolds, exhaust solutions, ignition systems, and even full fuel delivery kits.
Why Enthusiasts Choose Holley
- Unmatched History: Over 100 years of performance innovation.
- Complete Solutions: Everything from fuelling to exhaust under one brand family.
- Motorsport Proven: Trusted in drag racing, circle track, and street performance applications.
- Modern Technology: Cutting-edge EFI systems that bring classic builds into the future.
Popular Holley Products
- Holley 4150 & 4160 Carburetors
- Sniper EFI Conversion Kits
- Holley Terminator X Engine Management
- Fuel Pumps & Regulators
- Holley Intake Manifolds
Holley in the UK
Billy’s Speed Shop brings Holley performance parts to the UK, eliminating the cost and hassle of importing. Whether you’re restoring a classic V8, tuning a modern LS swap, or building a drag car, Holley offers the solutions you need – available now with fast UK delivery.
Fuel your project with Holley UK performance parts – order today at Billy’s Speed Shop.



