After doing some valve work on my 71 B20E (replaced a couple of valves, had hardened seats put in on the exhausts and a 3 angle valve job), I decided to cc the combustion chambers. I measured volumes of 46.7, 47.1, 46.9 and 46.3 cc which translates to compression ratios that vary from a low of 10.54:1 to a high of 10.73:1. The burette I used to check the volumes had a measuring error of about +/- .1 cc, which in the best circumstances would reduce the maximum volume difference to 0.6 cc (or 1 cc in the worst circumstances). Does anybody have any suggestions as to what is an acceptable variation between cylinders in terms of cc volume / compression ratio?