Upgrade your classic ride with the top-tier 1966 Chevrolet Fullsize Engine Harness designed specifically for big block engines equipped with a factory gauge setup. This expertly crafted harness ensures reliable electrical connections, maximizing performance and enhancing the longevity of your vehicle. Unlike generic alternatives, our harness is modified for seamless use with GM H.E.I. distributors, providing you peace of mind as you hit the road in style.