^^^ This is sooo inaccurate!!
Any machine shop with half a brain will inspect and mic your cylinders to determine if a .010", .020" or greater oversized piston is needed.
Then once the pistons are in the shop's possession they'll mic the pistons to determine their exact diameter at the proper location vertically on the piston.
Then they'll bore, chamfer and finish hone your cylinders to achieve the optimum piston to wall clearance.
There are piston manufacturing tolerances that can be off a couple thousandths bigger or smaller.
Boring cylinders to next oversize without having the new piston dimensions verified for optimum piston to wall clearance is completely and totally fucking retarded.