Hi All, I know generally only God knows what's wrong with a motor before it's pulled down But here goes; got an '8Os' OT truck with sbc, possibly a 305. On start up cold it runs great, then after 45 seconds or so it starts smoking out of the right hand tail-pipe, a bit on the left side too but not that noticeable. As the motor warms up the smoke really pours out of the tailpipes, just about all out of the right hand one - which also 'puffs' a bit. Disconnecting the hose that runs from the passenger side valve cover to the air filter sees fumes/smoke puffing out of that hose. Going down a long hill sees no (visible) smoke behind the truck but going back up it looks like a crop-duster plane is going up the road, smoke everywhere! Points of note: the po has overfilled the oil - but not by much, maybe 3/8th inch, compressions all within 10lb but lower than the Haynes manual says they should be, motor runs great hot or cold. Any ideas before I tear it down - or fit another motor?