I have a set of Fentons, but something looks goofy. I'm wondering if maybe one is old design and the other is newer. Anyway, one is stamped CHEV. H-604 FRONT in such a way as the letters are stamped into the manifold. The other is marked H603 REAR in raised letters. The outlet is beveled to accept a gasket. The Front one is not beveled.
Is this common?
Dennis


40 Chevy 1/2 ton