I have a ventilation tube from the passenger side valve cover to the intake manifold on my 56' truck. I want to get rid of it, because i'm installing some offy covers, offy 3x2 and also a finned valley cover. But were to go with it?
I thought to make an NPT hole in the valley cover at the back site, and from there a hose to the manifold.
Will this work? Or has someone a better idea?
Is this a 272, 292? I know the newer 292's run a crankcase vent tube off of the valley cover in the back. Then the steel tube runs down the back of the engine. I know Casco Thunderbird parts sell new crankcase vent tubes, you just would have to find a valley pan that has a vent hole.
I have a ventilation tube from the passenger side valve cover to the intake manifold on my 56' truck. I want to get rid of it, because i'm installing some offy covers, offy 3x2 and also a finned valley cover. But were to go with it?
I thought to make an NPT hole in the valley cover at the back site, and from there a hose to the manifold.
Will this work? Or has someone a better idea?
Thanks
There are a few issues here. Finned valley assumes not the usual fill tube and no PCV outlet in the rear. 3X2 probably gives no PCV port on the carb.
The '56 truck engine has a side mounted road draft tube for crank case ventilation. They were fairly efficient, but messy for some people. But to use it would require either something like the side valve cover vent., or a conventional fill tube vent in the front of the valley cover.
Getting a hole properly drilled into the finned valley and then a tube installed satisfactorily created enough trouble for me, that I threw the finned valley cover away, going back to the stock. What do you have showing there but 2.5 inches of fins ?
So I suggest ditching the finned valley for a stock one, and going to the side mounted road draft tube. You also will need the '57 and later distributor.
Sometimes, maybe many times, we make things much more difficult than they should be for the sake of cosmetics. Like the 3X2 is a good cosmetic old school, but the draft tube is a bad cosmetic ol skool. Also along this line, I expect you know already that the Offy 3X2 manifold is at the bottom of the list of desirable intakes. That puts it in the relm of eye candy for the uniformed.
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1946 1/2 ton with Y-block
1964 F-250, 292 4 speeed
1990 Ranger 4WD
1954 Model 600 tractor
My engine is ECG-C ,thats 272 i was told.
There is no draft tube one the site or rear of the engine, only from one valve cover to the intake. Maybe this is because of the ford-o-matic. Seems to be original this way, i have seen it before. My valley cover only has a fill tube with the breather.
I have an offy 3x2 with the bigger ports and there is a 3/8 NPT between the front and center carb, so thats no problem. I think it will work if i get it done right?
My engine is ECG-C ,thats 272 i was told.
There is no draft tube one the site or rear of the engine, only from one valve cover to the intake. Maybe this is because of the ford-o-matic. Seems to be original this way, i have seen it before. My valley cover only has a fill tube with the breather.
I have an offy 3x2 with the bigger ports and there is a 3/8 NPT between the front and center carb, so thats no problem. I think it will work if i get it done right?
Way is the intake so bad anyway?
Thanks
You can run an inline PCV between a port at the rear of the valley and the port described on the manifold. The inlines usually take a 1/2 in. ID hose between the cover and valve, and 3/8 in ID hose from the valve to manifold.
Someone apparently removed the side draft tube and put on a block off plate. Another option would be to reinstall it.
The Offy's are noted for poor breathing and A/F mixture distribution.
I have never heard of or seen an OE breather for the Y mounted on the valve covers. Guys do make that mod, however, for various reasons. I think Ted Eaton's racing engine has a breather on each valve cover.
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1946 1/2 ton with Y-block
1964 F-250, 292 4 speeed
1990 Ranger 4WD
1954 Model 600 tractor
I found the block off near the full pump, 2 bold holes and a plug with about 1 inch diameter. I think I will have to look for a lter valley cover or make a fitting.
Tried to get some picts of my PVC set up. Too much stuff in the way to get a straight shot. Goes from finned aluminum cover to back of intake.
I agree with most of the things 46 Y-Block said about using the finned cover, but I have found it works better (for me) because it is more rigid and less prone to leakage over time. Thus I feel it was worth some inconveniences on the first install.
Another thing to watch out for if you decide to use the finned cover is clearance between the fins and the bottom of the manifold. it can actually hold the intake manifold up, preventing it from sealing to the head. I had to grind the fins down in places, especially around the thermostat area.
Thought of something else. If you do decide to use the finned cover, machine some slots where the intake runners go into the heads, otherwise you will have to remove a head to get it on and off.
I'm having the same mess of a problem - the p.o. of the 292 I have apparently removed the pcv system. It's a 62 or later truck motor, and the guy must have changed the valley pan over, as it has no hole for the pcv system. As it is, I am trying to figure out what to do about it. I can't find a replacement valley pan, so I am left either cutting up the one I have, going to a valve cover style system, or attempting to graft the draft tube from a 239 Y block onto it that I have laying around (and if everything else about that motor holds true, it probably doesn't fit).
Y-blockhead's setup looks clean, so if he pops back in with where he got that grommet and valve, I will probably go that way.
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