What I have been told is that the GT350 valve showed 8 treads and was painted black.
The one that came in my car (5S275) when I bought it in Feb.1988 is dated 39-5.
Never checked the treads on it when replaced it in 1990. Don't remember if it was black or just rusty.
My Swedish friend rebuilt the original and I painted it black and adjusted it to 8 treads.
Haven't put it into the car yet.
Texas Swede
The one that came in my car (5S275) when I bought it in Feb.1988 is dated 39-5.
Never checked the treads on it when replaced it in 1990. Don't remember if it was black or just rusty.
My Swedish friend rebuilt the original and I painted it black and adjusted it to 8 treads.
Haven't put it into the car yet.
Texas Swede