OER Parts offers a wide selection of Valve Covers for your 1985 GMC C3500. OER Parts offers 1985 GMC C3500 Aluminum Valve Covers, 1985 GMC C3500 Chrome Valve Cover, 1985 GMC C3500 Transparent Valve Covers, 1985 GMC C3500 Logo Valve Cover, 1985 GMC C3500 Finned Valve Covers, 1985 GMC C3500 OE Valve Covers, 1985 GMC C3500 Billet Aluminum Valve Covers, 1985 GMC C3500 Low Profile Valve Covers, and 1985 GMC C3500 Tall Profile Valve Covers.