383 runs like a giant turd WTF

JohnRR said

The pistons would have to be at zero deck and the heads chambers at 80cc , or smaller if one does not deck the block as even the speedpro slug is .015 in the hole in a factory deck block.

Dwayne Porter built a 500HP 383, it had a stock lift cam ... .450 ... with a lot of duration and the heads had no porting at all , he had to cut valve reliefs in the pistons .

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My heads have nail head valves, which eat up cc's over the tulip head factory style valve, and have been milled. Mine CC'd at either 73, or 74 CC's. The no valve notch helps the compression issue too.
Another member here runs the .509 MP cam, and has around .080" valve to piston clearance. Mr. Porter and I have spoken quite a bit, he's not far up the road... He is the one that told me the .528 MP cam has more clearance than the "509" cam.