Revitalize your classic ride with the 1966 Chevrolet Fullsize Engine Harness designed specifically for big block engines equipped with H.E.I. (High Energy Ignition) systems. This high-quality wiring harness not only ensures reliable electrical connections but also simplifies the installation process, providing a straight upgrade from your old wiring. Say goodbye to the frustrations of faulty wiring and hello to hassle-free performance—it's the perfect solution for restores and upgrades alike.