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oversize pistons well of coarse are bigger but you will have to take your block to a machine shop and get them to bore it to the size of the pistons you have best thing to do is take your block and pistons to the shop and let them do that for you depends where you live but to get it bored can average to a $100 or up and if you get oversize pistons you will also need rings to fit the pistons and the other difference in oversize and standard the overside will give you more hp.

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14y ago
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Q: Whats the difference with stock size pistons and oversized?
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