coffmans 61 x mani on a 62t,anyone tried this

it looks like the coffmans has a good bit of material in the top part where the seal would meet up pretty well after its grinded out to port match on the top of the port roof.not sure about the bottom part,looks a little thin,slighty diff water jackets than the fpp mani anyone ever test this out to see if it would seal long term,maybe with a new gasket and some yamabond?
 
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x2addict ran a coffman mani on a T cylinder for awhile. never had a problem that i know of. Pretty sure the ski and engine are still going.
 
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