I can't believe nobody has one of these. Thanks to all the guys who have checked for me to see if they had one. Its just a 396 STD. bore stock piston. So I'm trying one more time. A new one is $120.00 and that's just stupid when a set is $249.00. But I have to have all the pistons changed on the rods and the whole drill. Its just a lousy beer chaser engine for my flat bottom and a spare at that. Help somebody.