Holley HP EFI ECU and Harness Kits 550-606N 1Inventory Engine: 396 CID Big Block

Engine: 396 CID Big Block

Nut Is Included

7” low glare

1973-1974 GMC K15/K1500 Pickup 250 CID

Does NOT fit models equipped with Flex Fuel (E85)

Holley HP EFI ECU and Harness Kits 550-606N 1Inventory Engine: 396 CID Big BlockHP ECU AND HARNESS, FORD MPFI, NTK Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine