Changing a 400 to a 426

In stock size the 400 has a 92mm piston with a 18mm wrist pin and the 426 has a 95mm piston with a 19mm wrist pin. You can buy a 400 piston that is 94 mm oversize piston with the correct size wrist pin. Is there any way I can buy the 94mm piston and put 426 rings on it to fit the 426 bore or will there be to much slap with the piston being 1mm smaller. My bike needs a rebuild and I can get the cylinder for next to nothing. I need all the help I can get.

Thanks :banghead:

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