[Tom Goldman]

Art, I use the calculator Dave uses. ...I also use Challenger engine software. ... Both programs came out with similar numbers,altho higher than yours, using the specs you posted. . .....You didn't spec the gasket bore, but assuming it is 3.520"i.d., both programs indicate 14.25 to 1 compression with the .040" gasket,and 12.75to1 with an .080" gasket, if the 7.5cc dome volume is the net volume,including the valve reliefs ......Tom