Upgrade your classic ride with the 1966 Chevrolet Wire Harness engineered for big block engines equipped with H.E.I. (High Energy Ignition) systems. Designed with precision, this harness not only supports your vehicle's ignition needs but also incorporates warning lights and A/C functionality, ensuring enhanced reliability and performance. Experience the benefits of a modernized electrical system in your vintage Chevrolet, far surpassing standard alternatives in quality and durability.