I've got some hq heads for pre pollution hj 253, and they've been ported and polished with bigger valves, they're not too big (IN 1.841" EX 1.539) I've read that the bigger valves may touch the block or piston, but that I can check when I do head gaskets, I've also read that bigger valves actually lessen performance of a 253, my question is, will it lessen performance with a 350 Holley and extractors. I'm also willing to try and port match inlet manifold to the heads, but I don't want to change heads if it will still leave it with less guts. Help me please
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