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A 355 is just a 350 bored 0.030 over. There really is no difference. this is true but to further the answer if only you bore the cylenders out in the block you will need to buy aftermarket pistons to make up for the new wider space so you dont have compkications with the pistons slapping the cylender walls

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15y ago
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Q: What is the difference in a Chevy 350 small block engine and a 355 small block engine?
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