Quote:
Originally Posted by To_Slow
61 rms
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Sure about that number? We had some plates ground a while back and took some measurements of re-ground used and brand new OE plates. We found a new set of OE plate to be about 12 Ra (micro-inches) on average. Our guy got the used plates to an average of 8 Ra.
The rough correlation between the RMS and Ra is around 11%. So our measurements for the stock plate would roughly be 13 RMS.
They look to good to be as bad as your measurement would suggest.