[s-cars] More Positive Crankcase Pressure 101

[DGraber460 at aol.com]

I recently swapped a replacement WX into my 83 URQ because the crankcase was pressurizing to the point of blowing out the dipstick, which fits rather tight, and giving the engine bay a nice oil bath. I had checked all the check valves, hoses, and systems (even replaced with other known functioning units), to find everything in working order. Did a compression check and found #2 cyl. at 30lbs. compression. Bingo, I thought this was a standard ring problem. On dissassembly, #2 bore and its rings look just like the rest of them. Valves, stems, seats, and seals all look to be identical and non problematic as well.
Me and 2 other pro mechanics are totally puzzled from the visual inspection. No apparent "smoking gun" as to why. The replacement WX is running fine with all the same CCV equipment. A machine shop inspection might find a ptoblem with #2, but visually it sure doesn't look like a severe enough problem to account for 30lb. compression.
I'm interested in what you find in the end.
FWIW- I am running 18-19 lbs. (gauge) boost.    

Dennis
Denver