OER Parts offers a wide selection of Valve Covers for your 1986 GMC K3500. OER Parts offers 1986 GMC K3500 Aluminum Valve Covers, 1986 GMC K3500 Chrome Valve Cover, 1986 GMC K3500 Transparent Valve Covers, 1986 GMC K3500 Logo Valve Cover, 1986 GMC K3500 Finned Valve Covers, 1986 GMC K3500 OE Valve Covers, 1986 GMC K3500 Billet Aluminum Valve Covers, 1986 GMC K3500 Low Profile Valve Covers, and 1986 GMC K3500 Tall Profile Valve Covers.