Hello fellow travelers. Here's one for you. I just rebuilt the B-20E in my '71 1800-E. Nothing fancy, just wanted to get it up to par. I did install a little stronger cam, but other than that, everything is standard. The pre-rebuild engine had never pulled good vacuum and I figured it was time. There was very little wear except for the cam which had a lobe or two worn badly and I figured that to be causing most of the problem. Well I got it running (using the oil pump priming technique I learned on this site THANKS) but it doesn't run well and the vacuum is low and fairly steady at idle, there's a bad hesitation in the acceleration until pushed to about 2000 RPM at which point the vacuum also rises into a normal range (steady). But what really concerns me is the compresssion test I just put on this engine. First test was done with warm engine and screw-in type gage. All cylinders showed 150 PSI + or - 1-2% Fine. So I check the green book and discover that 170-200 PSI is more like it. So I proceed to the wet test and all cylinders show between 185 and 205 PSI. I must assume that all this is related since what I know about auto mechanics says it should be. Where am I going wrong here? Ignition timing is correct. Valve timing and adjustment are correct. Can't find a vacuum leak to save me. Have I made some basic error in the assembly of this engine? What would explain the compression #'s ? Is it typical for a fresh engine to exhibit such disparity from dry to wet comp. test #'s until the rings are fully seated? I know there are some good mechanics out there with alot of Volvo knowledge. What do you think? THANKS Mike