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... Even with those tight 72cc chambers the pistons are probably blob domes near 20 CC..
Its just very difficult to get a 3.75 stroke engine to 14:1.. thats all.


Good point. It would probably run better milling more from the heads and lopping off the domes(the pistons intake pocket will most likely need radial clearence anyway w/ a 2.25 int), provided you have enough P-2-V depth. Honestly, I would consider a custom ground cam for about $200 more.(factor-in selling the current cam)