OER Parts offers a wide selection of Valve Covers for your 1977 GMC C35. OER Parts offers 1977 GMC C35 Aluminum Valve Covers, 1977 GMC C35 Chrome Valve Cover, 1977 GMC C35 Transparent Valve Covers, 1977 GMC C35 Logo Valve Cover, 1977 GMC C35 Finned Valve Covers, 1977 GMC C35 OE Valve Covers, 1977 GMC C35 Billet Aluminum Valve Covers, 1977 GMC C35 Low Profile Valve Covers, and 1977 GMC C35 Tall Profile Valve Covers.