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well 906 heads are 88 cc not 90 cc and also i mite put a set of 915 heads on it , i dont know yet , ,,,,,,, less then 7 , sounds alittle wrong to me , well i had my nitrous guy come over and do some hands on ,, and came out to be 8.266 compresson with 906 heads



88 or 90 cc's !! ... whatever !!! ... what you have here is a very possible fat-deck-height, a very thick head gasket and a HUGE dish in the piston.

8.27 compression ratio ? ...in-your-dreams !! ... Your nitrous-guy has sniffing waaaay tooo many fumes !!