HP Smart Coil Ignition Harness - 558-312 direct-fit 400" raised cam height &

400" raised cam height & (Jesel or similar) external

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The factory 1 piece line is nearly impossible to install unless you lift the cab off of the chassis

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HP Smart Coil Ignition Harness - 558-312 direct-fit 400" raised cam height &Overview: 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, wiring, terminals to connect directly to a