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Originally Posted by Stealth
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Someone also measured the piston wall to be inconsistent on some shs pistons as well, with one side being thicker than the other side along the body.. this probably won't affect anything and you probably won't notice it with the naked eye, but having the spring cavity somewhat off center of the piston body might have a bad effect on piston return time or spring behavior because the spring may not be perfectly aligned. BUT... I doubt it's off enough to do anything significant since the spring has a tendency to shift around a bit off the centerline as it moves anyways.
The 15Ts are still good pistons for the price though.
Swiss cheesing is not necessary... but has a number of benefits to doing it, especially on heavier piston assemblies. A lighter piston is also quieter... less mass smashing into the cylinder head means less noise.