Upgrade your classic ride with the 1963 Chevrolet Fullsize Engine Harness designed specifically for H.E.I. installations. This high-quality wiring harness not only ensures reliable performance but also provides a seamless fit for your 409 C.I. engine. With precise modifications for a GM H.E.I. distributor, this harness stands out from generic options, delivering enhanced durability and safety for your vehicle's electrical system.