Port size adapters, set of 3, GMC small port to GMC large port, 228-302.
Install these adapters in a small port 228-236-248-256-270 G.M.C. head and you can use manifolds made for the 270H and 302, including our supercharger manifold. Turn them around and use antique small port intake manifolds on your 302. Set of 3: $35.00. We can ship by Priority Mail. #PSA228-302
