OER Parts offers a wide selection of Valve Covers for your 1966 GMC Truck. OER Parts offers 1966 GMC Truck Aluminum Valve Covers, 1966 GMC Truck Chrome Valve Cover, 1966 GMC Truck Transparent Valve Covers, 1966 GMC Truck Logo Valve Cover, 1966 GMC Truck Finned Valve Covers, 1966 GMC Truck OE Valve Covers, 1966 GMC Truck Billet Aluminum Valve Covers, 1966 GMC Truck Low Profile Valve Covers, and 1966 GMC Truck Tall Profile Valve Covers.