just like J.S. says, seats have to be positioned in the right spot on valve and there is a spec. for the width also. this is done with the three angles. standard procedure on a valve job. the 1 degree interferance fit is to get a good or quick wear in.or even if you get a spec of carbon stuck in seat it wont stay there. the installed height for example was critical on the old ford engines like the 390's because there was no lifter adjustment. you just tightened the rockers down and that was it.
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