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I too noticed a small amount of uneven but not sharp material on the exhaust runners on a set of Edelbrock RPM heads that were just installed on my engine.
I thought that it was no big deal but my engine builder said that since the heads were going to the be ported (I believe the intake runner volumn is only 170cc) anyway we would get the exhaust cleaned up as well.
By the time that the heads were returned, they had been ported, surfaced, cc'd and stiffer springs.
I sure hope that all the expense was worth it.
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