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Originally Posted by zeroaxe
KaferChris,
...What I dont really get is the difference between 'A' and 'B' pistons. Are those different in the 'profile' on top of the piston?
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'B' pistons have the wrist pin moved further toward the top of the piston to lower compression ratio (CR) when assembling an engine with a longer-than-stock stroke or longer connecting rods, they've also got more clearance on the skirts so that they do not hit the opposing rod or counterweight at the bottom of the piston's travel known as bottom-dead-center (BDC).
Since both pistons use the same length barrel the engine's overall width won't be any greater than stock (except for other conflicts that arise with CR and deck height), essentially making the engine appear stock and allowing stock sheet metal to fit without alteration.