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The 500 is a '71 cast 400 block bored to 4.375" with the 440 source 4.15" stroker kit and the flat top pistons. I have the BCR aluminum main caps and girdle kit to beef the bottom end. I used a custom comp solid roller cam ground with the HXL lobes. A mild 264/264 @ 0.050" duration, 112 LSA...

What springs and install height? I have PAC 1325 springs at 1.950" install height on my 500' stroked 400. About the same seat pressure as yours, and just a bit over 700# open (0.714" lift.)

pretty stout combination. Is the cam duration in the 270's @ 0.050"? I'd guess 650 to 700 HP? 4150 carb, even 950 or 1,000 cfm may limit power. 4500 with adaptor might be better if you have the hood clearance.

24cc dish piston from 440 source with 75cc heads is about 9:1. http://store.440source.com/Platinum-Series-Pistons-4375-24-Dished/productinfo/5057/