Prolly a cracked ring then.
Do a compression check.
and here's another question...Is it a correct gm valve for a turbo car?
The actual valves or the covers?
I think he's talking pcv.
I think i knocked the little s hitter to death. .
I'd get a knock gauge from Casper's Electronic so you can see what's going on.
Got a used set here Jim. Engine had less than 80K on it if you're interested. Rods included.