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I'd believe that more than a drag slip.
MPH at the end of the quarter mile combined with car weight info is a fairly accurate means of determining HP. When I went to the drags I recorded times from 15.5 down to 14.6 seconds, but the difference in MPH was 89MPH slowest, 92 fastest.
Dyno sheets are rather meaningless without a control set of figures for comparison. Mine saw a dyno repeatedly, but how meaningful is 72kW to you?
For the record, my block needed 0.020" knocked off the top.
Aren't you using custom rods & pistons?
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