I think the main question for me is this...

Was any machining done to the cases?

Cause in the club that I run in, that is all that matters to keep the bike legal for Super Bike racing. This is how the TZR get away with (cheating, I mean) using the TZ engine parts.

So if I could somehow get a full RS top end, onto a NSR bottom end without touching the cases, except for a little porting and cleaning work, then all should be okay.

Thanks,
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Charles Gallant