[91Caprice9c1]

94 1L 5-spd. Bored 0.030 over, valve job, new valve seals, new pistons, rings, etc. Rebuilt from the ground up. Machine work done by a reputable shop, Assembly done by me, a reputable builder. Car runs like a top, compression is perfect, 210 across the board. At highway speeds 60+mph, a HUGE plume of smoke emits from the exhaust. It is caused by oil from the pcv system finding its way through the intake. New PCV valve, free flowing fresh air inlet tube, and free flowing pcv to intake tube. This much so far I know for a fact, so why is this happening?
The only thing I can think of, is that the aftermarket PCV valve is insufficient. I wouldn't be surprised at this, as last week I had to cut my own TB gasket because the aftermarket ones I acquired (3 different gaskets) allowed a sizeable vacuum leak at the mating between the TB and the intake manifold. Any ideas before I try a pcv valve from the dealer? I maintain a fleet of 20 of these cars, and this is the second car to have this problem. The other one is high mileage and I haven't gotten to inspecting the pcv system - But for all intensive purposes this engine is practically brand new!

-MechanicMatt