my static will come in at 11.4, dynamic will be 9.85 with 207psi cranking. looks like pump gas may be out for me even though i will have .040" quench. will see.

Also double check valve clearence if you haven't already done so. The pro com heads I have are 2.25 intake and 1.88 exhaust. They hit the 426ci 4.25 bore block and my shalow valve pockets on my stock street wedge piston about the same time. I was trying to lift .570

My biggest problem with pump gas has never been detonation, but inconsistancy. My buggy only has around 8.5 but every so often it tosses out a really off pace run or picks up. I went to the 100 unleaded gas and it stopped. All fillin' station fuel is not created equal.

Thanks for the input. The motor is stock 440 bore and I checked valve clearance on a 440 and it looks fine. The pistons have some pretty decent reliefs, and I plan on checking clearance there. The heads are off right now waitting on parts. I think quench is gonna be a strech at .025 in the hole, and a .039 head gasket. I was thinking about putting on a thick head gasket to drop the compression a tad since now would be the time. dynamic calculator says my CR should be 10.7 to one.