a mate of mines rb20(170,000k's) returnd 110 across all 6 on a comp test(snap on comp tester)... his motor has copped an absolute caining.. we havent been able to kill it yet its not so much about the reading as for some reason all the comp testers ive used have returned different results compared to others
you also have to remember an rb20 has very small stroke/bore dont expect it to have similar compression on the tester compared to a rb25/26 or a 30 mainly look at how even it is across the motor.. but in saying dont pay to much attention to the pressure reading.. if you havent got 3 didgets as the read out.. it might be something to look into
thats my thoughts anyway..