I have to say phill that I disagree with your builder. I cleanrece all of the rotors we use in engines that we build.
There is no risk in having it, only a risk in not having it if you are running more power than stock.
This is my professional opinion.
Basically you have a rotor that has clearence for operating in what the stock form was engineered for. By increasing combustion pressure you are going to move the rotors back and for more often and with more force risking the rotor touching the side plates....
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