OER Parts offers a wide selection of Valve Covers for your 1977 GMC K25. OER Parts offers 1977 GMC K25 Aluminum Valve Covers, 1977 GMC K25 Chrome Valve Cover, 1977 GMC K25 Transparent Valve Covers, 1977 GMC K25 Logo Valve Cover, 1977 GMC K25 Finned Valve Covers, 1977 GMC K25 OE Valve Covers, 1977 GMC K25 Billet Aluminum Valve Covers, 1977 GMC K25 Low Profile Valve Covers, and 1977 GMC K25 Tall Profile Valve Covers.