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They were both 400+ engine builds- a Buick 350 and 302. If it blows up, it blows up. I will check everything for clearance, but those heads are supposed to fit the 383. Hot Rod used them with no issues on .060" block. my block is .030"

of course these numbers are hypotheticals, but that is what my desktop dyno software is coming up with. 705 hp at 7500. Are you saying the valves won't clear the cylinder bores? I have built two engines that I estimated with the desktop dyno software, and both were within 10 hp on the dyno.

OK, so I finally got my heads for the 383 build. Here is the run down so far- '69 383 hp block, .030 over stock crank Eagle H-beam rods Edelbrock Victor heads Edelbrock Victor intake Lunati valve train Lunati mechanical roller .600 lift in & ex Milodon pan and oiling system So here's the...