Exhaust Manifold Gaskets: Pontiac 67-79 V8 normal "D Port" (pr)This "D port" normal tin gasket kit fits Pontiac V8 from 1967 79. This is for normal 99% of everybody with 326, 350 389, 400, 455 PONTIAC V8's.. except for a few special ROUND port early 70s performance heads.. but ROUND port you can tell.. its ROUND. not "D" in its shape Always use a exhaust gasket compound or silastic sealer with these. Each set has open center square or "D" shaped ports that measure 1. 53 in. x 2. 00 in. Ordinarily.. this is the