I just fired up my 261 for the first time after getting it in my truck and I'm getting white smoke from the road draft tube and the valve cover breather. A little history... 1958 Chevy 261 inline 6, I ran the motor before I pulled it out of the donor truck. I did 4 compressions tests - the highest number I had was 135 and the lowest was 120+. With oil and wide open throttle I got 150+ highest to 130 lowest. Seemed to be in decent shape. I pulled the pan for a visual inspection - everything seemed fine. I found a 235 head for it and had it completely rebuilt. New water pump, fuel pump, rebuilt carb, cleaned radiator... It stays at 180 degrees with just over 30 psi oil pressure. Got the valves adjusted and it runs nice and smooth and quiet. It doesn't have any smoke at all out of the exhaust. A little moisture but that's it. I did another compression test. My highest reading was 90 and my lowest was 60. What's going on here? The motor sounds fine and runs smooth. Any ideas? Thanks in advance.