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Clearancing the rotors is a definate when you are running high HP applications. Its not just needed for the sides, its also needed on the combustion faces of the rotor. When there is e shaft flex you want the rotors to have enough clearance so that the rotating assembly doesn't have any contact with the stationary housings. When there is contact, it gauls up seal grooves and also causes bearing failure. People do it differently and there is more than 1 way to do it.
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