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915's run about 84cc if I measured right , 516 ??? Do NOT use NHRA specs, they are smaller than actual.



I though they were like 78



That's the NHRA spec and it is WRONG

NHRA spec for 906 is 79.5 cc ... WRONG



NHRA spec. has nothing to do with actual chamber volume on a stock head. It's the volume that you have to follow to build a legal stock class racer.If you're under their spec in CCs,then your car would be illegal.