Hi Bolters,

I’ve been reading recent postings re: crankcase ventilation. Will this crankcase vent harm my ’54?

A PVC valve was added to my ’54 3100 at some point in its life. The truck runs well, doesn’t use oil, and doesn’t smoke. Will this setup damage my engine? Should I remove the PVC valve, install a road draft tube, and replace the valve cover?

My number one goal is to protect the engine. If changes are needed, I would like to return to factory appearance.

The valve cover is vented to a PVC valve in the intake manifold.
Pic #1
Pic #2

The PVC valve (AC Sparkplug Type OV-693G) is screwed into the intake manifold. The truck has electric wipers.

A rubber hose runs between the PVC valve and a pipe that is bolted into the valve cover.

A bent rubber pipe is press-fit into a hole on the top of the valve cover.
Looks like there was a mounting plate for the rubber pipe at one time. The four slots on the valve cover are open.

There is no road draft tube. A freeze plug covers the opening.

I believe that the truck was restored in California. Possibly altered to meet emissions requirements?

Engine serial number: 0369873F54U
Block Date Casting Code: CON4 B264
Vin # H54O007554

Thanks in advance for any insight that you can give me.

- Lonnie

- Lonnie
My '54 3104
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post.
lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt.

OLD STUFF ... houses, furniture, cars, wine ... I love it all