Alright folks I could really use some help solving a very mysterious problem. I blew a head gasket and got water in the oil of my old 350 two weeks ago. Luckily I still had the motor from my last blazer project. The history on that motor is that its a nice 350 that ran flawlessly when I parted the truck out. The previous owner of the truck claimed it to be a crate motor and by the way it ran then until now I had no reason to think other wise. I shecked the block # it was manufactured in 98' The motor sat on a roll around motor stand for the past year inside a shop, completely covered minus the exhaust manifolds. I spent a night at the end of last week replacing the valve cover gaskets, oil pan gasket and rear main seal, pulled the performer RPM intake off in favor of a regular performer and sealed everything back up tight. The good news is that the engine has no leaks--really nothing to speak of before but wanted to be sure that it wasnt going to need maint. again soon. Before planting the distributor I bought a manual oil pump tool to prime the motor over before starting it up for the first time. I dead timed it at 0 and it fired over first time, GREAT! I adjusted the timing with a timing light and advanced it to 8 degrees and hooked up the vacume advance. The motor purrrrrs but I have light exhaust smoke, looks bluish grey, smells like junk. I drove it around a bit and performance was horrible with all the combusted oil and smoke, so I drove it back home, at certain RPM's it'd almost level out, but still smoke. (we're talking mosquito smogger thick) Knowing I'd get pulled over for smog here I just parked it for the night. I next disconnected all unecessary vacume lines from the carb to eliminate the posibility of it coming in from the tranny line of pcv valve -- no change. I swapped carbs to the one that came off my running motor -- no change. I did a compression test and my results were: cylinder 1: 145psi fouled,oiled cylinder 2: 145psi fouled cylinder 3: 140psi fouled ____cylinder 4: 150psi fouled,oiled cylinder 5: 150psi fouled,oiled cylinder 6: 145psi fouled,oiled cylinder 7: 140psi fouled,oiled cylinder 8: 150psi fouled Since then I have pulled the valve covers and watched the lifters with the motor running and all seems fine--everything rocking at the same rate. I was told I may have clogged oil passages (this motor has approx 80K on it) and I have maintained it habitually so I doubted it but I figured I'd ram a doubled over coat hanger down them anyway just to make sure all was well.....no problem, no mentionable sludge. Next I ran motor flush through the motor maybe to free any sticking lifters and free up junk.... I replaced the oil and added some lucas oil stabilizer to maybe lube up the oil ways -- a suggestion from one mechanic at work -- no change Now I am still burning oil and not sure where it would be coming from....valve stem seals?? I cant see them smoking the entire time...The motor as you can see above has great compression and that was checked with the block cold. some times at startup I have no smoke and it slowly builds to a smog, other times it starts light right off the bat to much heavier, no matter what its thick when I goose it or drive it. I'm baffled where do I go next???? Please help its my DD and I need to not bum rides for another week.