to add to steve’s comment, different pistons swell different when they heat up that’s why there may be different clearances for different types of pistons…like for examples my endyn pistons say that i need like .029-.03* piston to wall clearnace even though oem specs say that .010-.030 is within spec
and like steve said your machinist should be boring/honing your cylinders to fit your pistons not the other way around.
thats why here created a thread jackass so he can learn…ignore this ass bag ^^