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cylinder differance 426 & 450

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hi there everyone,

i'm intersted in boring out my bike to 450 and wondering if anyone has any information about the differance between the 426 and 450 cylinders. i know a 450 has a 63.4mm stroke compared to the 60.1mm of the 426, but i'm not sure if the cylinder wall is thicker or not. i have seen 98mm pistons on the web for the 450, but i'm a little confused as to weather you can bore out the 450 0r 426 cylinder or is there a big bore one on the market i can buy.

hope someone can help.

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