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ORIGINAL: combatpigg

5.0, nice going so far. Don't over look the importance of lightening the piston and rod as much as possible, plus the possibility of notching the bottom of the piston skirt to uncover the boost ports. The crank counterbalance could also use a scoop of material removed to assist flow up the forward boost port as the piston begins the down stroke. The rod beam can be shaped to more of an oval cross section. All these little things add up.