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[Mockery]

our numbers are a bit different because you took 600/4 = 150cc per cylinder;
whereas if you use the bore & stroke to calculate the swept volume it says ~153.3cc per cylinder.
Gozer alluded to that already, a few posts up.
I checked the formula again, it works out okay. It's just rearranged from: CR = (cV+sV)/cV