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I really cant tell you a number....honesty Phil it been a long time, i have been tearing engines down for a really long time I would say 20 out of 100 had contact after going big single. The issue is that the rotors being clearence may not have been the issue there were so many issues, broken apex seal, carbon lock, detonation etc.
Now this is why it comes to a professional opinion, you may get away with it you may not...I dont want to risked it. If their was a big risk in having more clearence i would worry but there is not. So the risk out ways not doing, but again this is my professional opinion. Phil your guy may never have had an issue so in his professional opinion he say its not worth it. I was not saying anything about his skills I dont know the guy but I do know I believe in it.
I built an engine with no clearence (stock rotors) it blew up two reasons one the rotors hit the side plates and it had looked liek the shaft deformed., Rebuilt it not changing anything but clearnce the rotors and it is still make power today that was years ago.
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