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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.



Huh ???

NHRA spec , which I'm told is given to NHRA by Chrysler says that the combustion chamber volume of the 906 head is 79.5 cc , 906's out the door from Chrysler typically are 90 cc, I have had more than 1 pr at 92 cc ...

The op asked for 915/ 516 chamber , I have had 2 sets of 915's , neither were below 82cc, NHRA spec is lower than that.