Hi, Thanks for getting back. Your working with an apprentice. The 1 ton panel has the '61 engine with hydraulic valves and the hole in the intake manifold. "Engine vacuum draws harmful vapors through crankcase ventilation into the intake manifold." (April 2011, Vintage Truck Magazine, Crankcase Ventilation by Bob Adler) Everything you have stated about the PCV plumbing is what his article says and shows. Then the PCV valve is on the replacement PCV tube with a tube that crosses back over the valve cover to the intake manifold.
The engine and 3 speed transmission with overdrive came in the truck when I brought it and I do not know the history. However, it looks as if an engine blew or a blade from the fan punched a hole in the right side of the engine compartment. We're (the mechanic and I) are guessing the engine and tranny were taken from a '61 automobile and put in the truck.
According to the article "Chevrolet started offering PCV valves in 1948 on its forward-control parcel delivery vans. In 1950, it offered a retrofit kit for all 1949 Chevrolets." It also states, "The draft tube's last gasp on Chevys was 1962."
It also states "Some sources say GM invented the PCV valve for use in Army tanks during World War II." So they could ford deep water.
The NAPA parts number for the '62 valve is 2-9215. I also need to look for the replacement PCV tube to replace the road draft tube.
The '54 engine is in our '54 3100 and appears to be the original block. It doesn't have the hole in the intake manifold.
I didn't realize the Bob Adler includes his phone number and e-mail address in the article until I referred back to it today. I will try contacting him for more info.
Unfortunately I am not computer smart and do not know how to do photos.
Bettyann
