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Instruction Sheets for Part Number HLY-558-312
Holley HP EFI Smart Coil Sub Harnesses
Ignition Coil Wiring Harnesses, Holley EFI, HP Smart Coil, Ignition Harness, for HP/Dominator ECU, Chevy, LS Based, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L, Each
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
558-312
Part Type:
Product Line:
Summit Racing Part Number:
HLY-558-312
UPC:
090127688120
Quantity:
Sold as a kit.
Notes:
For use with the Holley Smart Coils HLY-556-112. Connects to Holley HP or Dominator ECU's.
Holley HP EFI Smart Coil Sub Harnesses
Holley HP EFI smart coil sub harnesses contain two preterminated harnesses designed to work with Holley HP smart coils used on 8-cylinder engines. One end plugs directly into the Holley smart coil, and the other end features a 7-pin Metri-Pak connector that plugs into the Holley universal coil-on-plug harness (HLY-558-307, not included), Holley LSx main harness, or factory GM LSx harnesses.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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