Mark -
Your setup looks similar to the PCV that was on my '54 3104 when I bought it. I have since eliminated it and replaced it with an unmolested '54 valve cover and a road draft tube.
I posted a similar question with pics in Jan, 2011, but the new forum software hid it.
Here is part of my original post and a great response by "CrankyOldDude"
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The valve cover is vented to a PVC valve in the intake manifold.
Pic #1Pic #2The
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
That is pieces of the AC (AC spark plug of General Motors Corporation) "California State Approved" crankcase ventilation system. California required most 1950 and later cars and trucks to be retrofitted with a PVC system when a used vehicle was sold. The program originally started from January 1, 1964 and ran through January 1, 1966.
The installation required two kits, CV3 and KV1002. CV3 consisted of an intake manifold fitting, 3/8 hose, CV609 PCV valve, hose clamps and fitting to the valve cover for an open PVC system. KV1002 closed the system, it consisted of 5/8 inch hose fittings, 5/8 hose to connect air cleaner to the valve cover for clean air induction, sealed oil fill cap and a plug to close up the hole after the road draft tube was removed. The slots on the valve cover were soldered closed.
I believe your PCV valve is a CV693C. If so, it is installed backwards so the flow is backwards. CV693C is designed to mount on the ventilator for the factory installed PVC system on 261 engines as well as California 1960-62 235 engines.
If you want to keep this setup, I would recommend finding a CV609 valve. I would reconnect the open hole on your valve cover with a 5/8 hose to your air cleaner. The CV609 valve is spliced into the hose that connects the valve cover to the manifold fitting. You will need to find some hose fittings, hoses and a CV609 PCV valve.
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Tracking the history of these old trucks is part of the joy of owning them!
- Lonnie
