Valve Covers

[DonkieHodie]

Hi,
The 1936 Ford Pick-Up Truck I am building is a home-built Old School Hot Rod like the kind I remember seeing back in the 50's & 60's complete with a back yard paint job.

My question: The Desoto Hemi Valve Covers do not have any ports for letting the engine breathe. The old engine had the usual downdraft tube, and I replaced the tube with a PCV Valve and hose connecting to the carb.

Do you think that the one PCV Valve will offer enough breathing for the old engine? or should I add more valve cover breathers like the old OFFY valve cover breathers?

Thanks for opinions,

[ponymare]

I would think if the engine had good compression and the blowby was minimum, one pcv would work ok

[alchemy]

Where is the "in" for the system? You need fresh air in and old air out. Maybe the original was just a wide open door, but you closed that door with your PCV.

[rotorwrench]

Some engines breath in through the oil filler cap but I don't know about the old Chrysler products. Many of the 60s & up vehicles had a rubber connector between the valve cover and the air filter housing, They put a small filter mounted in the side of the air filter housing to keep the inlet air clean. When the engines start to develop blow by, these filters would get full of oil in relatively short order but that can also be a PCV valve problem that isn't drawing the vapors well enough.

[DonkieHodie]

Hi, Thanks for the input. It never occurred to me about the air intake to the valve covers.
Must be age related. ( :
I put 2 small OFFY type breathers on each valve cover.

Thanks Again.

[Flathead]

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Originally Posted by alchemy

Where is the "in" for the system? You need fresh air in and old air out. Maybe the original was just a wide open door, but you closed that door with your PCV.

Yes, Yes, Yes!!! A lot of people miss this important fact. You must have a vent, a PCV alone is not a vent.