Cylinders are grouped by size (like rod weights) and marked on side of cylinders. You should really measure the bore and make sure it is in spec for ovality. The cylinders can look perfect and be out of round. The standard JE piston would have the correct clearance with the lower diameter cylinder group. Larger groups would have too much piston to cylinder clearance. You can have pistons made to the size to have correct clearance with larger group cylinders if needed. Generally cleaning up the bore by hand with red scotchbrite is all that is needed to get cylinders ready to reuse.
thanks,
john
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