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3.537 or something like that it is the big bore463707
"3 9/16 bore 31 cube pistons are the same size but appear to be dished"You are looking at an early 31 piston that was used with the .050" shorter rod for the single cylinder engines. Ignore those pistons. Use P/N 796172 for standard bore with ARC Rods.
OK MY BAD, STOCK IS 3.4 AND 3.5 IS 31ci. 3.6 IS 33ci. I HAVE YET TO HEAR OF A 3.6 BORE OPPY. I WAS TOLD IT WON'T GO THAT FAR, BUT I DON'T KNOW IF THE BIG BLOCK WILL GO THAT FAR. JEFF YOU HAVE THAT BIG BLOCK I HAD, WILL IT GO THAT FAR?