If you have to buy new pistons, you can order custom for any more size that rings are availble. Let your guy know that (you are buying pistons) and the block will most likely clean up at .035 or .036 over with a torque plate.. Have the piston made for that bore size. It's worthwhile to "square the decks" and get the pistons level with the deck..... IMO it's important to keep an original block like yours at the smallest bore possible. We have built several rare/original blocks using .005-.020 over sized pistons.
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