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558-208 | UNTERMINATED 24 INJ HARNESS

add_shopping_cart$378.00$339.95

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558-208 | UNTERMINATED 24 INJ HARNESSclose

Unterminated 24 injector MPFI harness Terminated at injector connectors (Bosch style). Harness must be assembled and require crimping Metripak 150 connectors. Includes all connectors, pins, terminals, and loom needed. for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeUniversal Unterminated Injector HarnessPart Number558-208..

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558-209 | FORD V-8 INJECTOR HARNESS

add_shopping_cart$212.00$189.95

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558-209 | FORD V-8 INJECTOR HARNESSclose

Ford V8 Injector Harness for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationFordHarness TypeInjectorProduct TypeFord EV1 Style Injector HarnessPart Number558-209..

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558-210 | INJECTOR HARNESS, V8 EVENLY SPACED USCAR

add_shopping_cart$167.00$149.95

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558-210 | INJECTOR HARNESS, V8 EVENLY SPACED USCARclose

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory injectors. The other harness is for the Bosch and Holley (or Jetronic/Minitimer) injector connector that is commonly used in aftermarket applications for larger injectors. View the image gallery to see images of both types of injectors.Feat..

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558-211 | INJECTOR HARNESS, V8 EVENLY SPACED JETRO

add_shopping_cart$167.00$149.95

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558-211 | INJECTOR HARNESS, V8 EVENLY SPACED JETROclose

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory injectors. The other harness is for the Bosch and Holley (or Jetronic/Minitimer) injector connector that is commonly used in aftermarket applications for larger injectors. View the image gallery to see images of both types of injectors.Feat..

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558-212 | INJECTOR HARNESS, FORD, USCAR, EVENLY SP

add_shopping_cart$167.00$149.95

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558-212 | INJECTOR HARNESS, FORD, USCAR, EVENLY SPclose

Ford V8 Injector Harness for Ford USCAR / EV6 style Fuel Injectors (Evenly Spaced)BrandHolley EFIEmission Code3Harness ApplicationFordHarness TypeInjectorProduct TypeFord EV6 Style Injector HarnessPart Number558-212..

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558-213 | INJECTOR HARNESS, FORD, JETRONIC, EVENLY

add_shopping_cart$167.00$149.95

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558-213 | INJECTOR HARNESS, FORD, JETRONIC, EVENLYclose

Ford V8 Injector Harness for Jetronic "Bosch" style Fuel Injectors (Evenly Spaced)BrandHolley EFIEmission Code3Harness ApplicationFordHarness TypeInjectorProduct TypeFord EV1 Style Injector HarnessPart Number558-213..

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558-216 | UNIV. UNTERMINATED INJ HARNESS EV6

add_shopping_cart$134.00$119.95

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558-216 | UNIV. UNTERMINATED INJ HARNESS EV6close

Introducing the latest addition to the Holley EFI Product Lineup! Our EV6 unterminated injector harness is perfect for anyone wanting to add EV6 injectors to their engine bay. This harness kit comes with everything you need to build a custom cut to fit EV6 injector harness for an 8 cylinder engine. Don't forget, if you need a quality metripack crimping tool to complete the job, Holley EFI has you..

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558-302 | TACH INPUT IGNITION ADAPTER

add_shopping_cart$19.94$17.95

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558-302 | TACH INPUT IGNITION ADAPTERclose

This is only used on applications using a CD Box, such as an MSD 6AL, while not using timing control.BrandHolley EFIEmission Code3Harness TypeIgnitionIgnition TypeCD Ignition (No Timing Control)Product TypeIgnition HarnessesPart Number558-302..

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558-303 | MAG PICKUKP IGN HARNESS

add_shopping_cart$88.83$79.95

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558-303 | MAG PICKUKP IGN HARNESSclose

Shielded Unterminated Magnetic Pick-Up harness for Holley EFI systems BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-303..

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558-304 | HEI IGN HARNESS

add_shopping_cart$49.94$44.95

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558-304 | HEI IGN HARNESSclose

HEI Adapter HarnessBrandHolley EFIEmission Code3Harness ApplicationGMHarness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-304..

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558-305 | FORD TFI IGN HARNESS

add_shopping_cart$112.00$99.95

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558-305 | FORD TFI IGN HARNESSclose

Ford TFI Ignition Adapter HarnessBrandHolley EFIEmission Code3Harness ApplicationFordHarness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-305..

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558-306 | UNIV UNTERMINATED IGN HARNESS

add_shopping_cart$178.00$159.95

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558-306 | UNIV UNTERMINATED IGN HARNESSclose

Universal Unterminated Ignition Harness for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeUniversal Unterminated Ignition HarnessPart Number558-306..

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558-307 | UNIVERSAL COIL ON PLUG HARNESS

add_shopping_cart$167.00$149.95

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558-307 | UNIVERSAL COIL ON PLUG HARNESSclose

Universal Coil On/Near Plug Harness – Use to connect Holley PN 558-312 or factory GM LSx coil harnesses to Holley HP or Dominator ECU'sFeatures:For use with Holley HP or Dominator ECUsUniversalConnects 558-312 or factory GM LSx coil harnessesBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeDistrutorless Ignition - DIS - smart coilPart Number558-307..

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558-308 | MAIN POWER HARNESS

add_shopping_cart$95.50$85.95

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558-308 | MAIN POWER HARNESSclose

This Harness is required with HP or Dominator ECUs. Includes, 13' long, 10 AWG main power harness, Qty. (2) 3/8" ring terminals and shrink tube (not pictured) . The harness is fuse protected and covered in braided split loom for additional abrasion protection . BrandHolley EFIEmission Code3Fuse40 AMP maxHarness ApplicationUniversalHarness TypeMain Battery PowerProduct TypePower HarnessWire Dia..

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558-312 | HP SMART COIL SUB HARNESSES

add_shopping_cart$223.00$199.95

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558-312 | HP SMART COIL SUB HARNESSESclose

HP Smart Coil ignition sub-harness. Includes a pair of coil harnesses for an 8 cylinder engine. These harnesses are similar in design to factory GM LSx coil harnesses, but plug into Holley HP Smart Coils. They plug into Holley LSx plug and play main harnesses if one wants to replace factory LSx coils with Holley HP Smart Coils. If using a non-LSx main harness, purchase PN 558-307 for connectors, w..

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558-313 | IGN, ADAPTER, FAST DISTRIBUTOR

add_shopping_cart$33.28$29.95

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558-313 | IGN, ADAPTER, FAST DISTRIBUTORclose

The Holley EFI Ignition Adapter Harness for FAST™ Dual Sync Distributors allows easy connectivity of the Holley EFI wiring harness to the FAST™ Dual Sync Distributors.Features:Allows customer to run a "timed sequential" fuel strategyBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeDual Sync DistributorPart Number558-313..

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558-314 | COIL HARNESS, 2V FORD MODULAR

add_shopping_cart$206.00$184.95

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558-314 | COIL HARNESS, 2V FORD MODULARclose

Coil harness for 99-04 2 Valve Ford Modular (4.6 & 5.4L) Engines. BrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-314..

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558-315 | COIL HARNESS, 4V FORD MODULAR

add_shopping_cart$206.00$184.95

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558-315 | COIL HARNESS, 4V FORD MODULARclose

Coil harness for 99-04 4 Valve Ford Modular (4.6 & 5.4L) Engines. BrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-315..

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558-317 | COIL HARNESS, FORD COYOTE (2011-2015)

add_shopping_cart$195.00$174.95

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558-317 | COIL HARNESS, FORD COYOTE (2011-2015)close

Coil Harness for 2011 to 2015 Ford Coyote (5.0L) EnginesBrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-317..

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558-318 | HP SMART COIL SUB HARNESSES, BIG WIRE

add_shopping_cart$239.00$214.95

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558-318 | HP SMART COIL SUB HARNESSES, BIG WIREclose

"Big Wire" Sub Harness- pre wired with 12ga power and grounds, for optimal performance! Features:“Big Wire” Sub Harness- Pre wired with 12ga Power and Grounds, for optimal performance!BrandHolley EFIEmission Code4Harness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-318..