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All metals have different tolerances, different treatment processes differentiate the tolerances also. You can get OEM-style pistons for that year of engine that is made of the same material and same treatment process and the tolerances will be rather similar.
 

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Race it, Don't rice it!
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Cast piston about .001-.003
Hyper piston .001-.003
Forged .003-006
Depends on application and intended usage.

Street stuff is smaller
Drag a little bigger
endurance even bigger
high loads for a long time like towing are even bigger.
 
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