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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 HARNESSclose
HEI Adapter HarnessBrandHolley EFIEmission Code3Harness ApplicationGMHarness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-304..
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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 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 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 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 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 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 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 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)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 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..
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558-319 | MAIN POWER HARNESS W/ AUX CONNECTORclose
Introducing Coyote Twin Independent Variable Cam Timing Control from Holley EFI! Do you have a coyote crate engine going in your dream car? Is your weekend road race warrior powered by a coyote junkyard engine with locked cams? Unlock the full potential of your high revving power plant with the Holley EFI Plug and Play Coyote Ti-VCT Control Module. Features:Plug and Play with Dominator or HP ECU ..
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558-322 | COIL HARNESS, FORD COYOTE (2015.5+)close
Introducing Coyote Twin Independent Variable Cam Timing Control from Holley EFI! Do you have a coyote crate engine going in your dream car? Is your weekend road race warrior powered by a coyote junkyard engine with locked cams? Unlock the full potential of your high revving power plant with the Holley EFI Plug and Play Coyote Ti-VCT Control Module. BrandHolley EFIEmission Code4Harness Application..
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558-400 | J1 A/B I/O CONNECTOR HP & DOMclose
BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ1 Auxillary Input/ Output Harness - ConnectorPart Number558-400..
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558-401 | J2A CONNECTOR & HARNESSclose
Used when adding a second wide band oxygen sensor to a Dominator EFI installation. Features:J2A Connector#2 Wide band oxygen sensor harness (Fully Terminated)23 user programmable input wires with pre-crimped ECU pinsBrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ2 Auxiliary Input/ Output Harness - ConnectorPart Number558-401..
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558-402 | J2B CONNECTOR & HARNESSclose
BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ2 Auxiliary Input/ Output Harness - ConnectorPart Number558-402..
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558-403 | J3 CONNECTOR & HARNESSclose
BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ3 Auxiliary Input/ Output Harness - ConnectorPart Number558-403..
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558-404 | J4 CONNECTOR & HARNESSclose
BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ4 Auxiliary Input/ Output Harness - ConnectorPart Number558-4043This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:1965 and older U.S. manufactured California Certified vehicles1967 an..
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558-407 | MULTIMAP SELECTORclose
Dominator EFI Multi Map SelectorBrandHolley EFIEmission Code5Harness TypeAuxiliaryProduct TypeMulti Map SelectorPart Number558-407..
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