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Piston on 79' yz 400 f

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I found a thread here at google, about the It 400 and the YZ, one suggested boring and fitting of 465 piston, does anyone know if the 465s jug will fit and the reed plate and exhaust difference if any ?

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I think the barrel to crankcase is different, I have an IT 425 (big bore YZ400) I can run a 465 piston as the ring pins just miss ports but it needs a 5mm barrel spacer or shorter rod for the gudgeon height. The 425 uses a YZ400 conrod.

The Wiseco 465 piston is awful heavy compared to a cast 425.

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Thanks for the info, i thought maybe a IT 425 piston might work, but they look different from the YZ's, i will check the vintage swap meet site.

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