302 ford eng. do you need a pcv valve

Anybody have an OEM or NAPA part # for a molded hose for a 302 with pvc? I'm looking for one from the valve cover to carburetor base.

 

You said this was a 88 engine, was it fuel injected, ? did you put a concentric on cam for fuel pump? use a steel gear on the dizzy for roller cam? and get value covers for a carb engine , the injected motor had pvc in rear of manifold. just questions to help you fine answers

 

In drag racing, 1/100 of a second can be eternity, so minimal, is still something. Optimal is 3 lbs vacuum as stated.

If the old 1 down and 1 up was true then all those rear main seals blown out would be a figment of your imagination....


You may have just ****ed up some **** from the tank and plugged the needle? Or it could be an ignition issue when at hot temps

 

I went thru the same questions, and wound up using a vented/baffled breather on each valve cover. (sbc 283)
Burns no oil, and runs fine.
But I do have to clean the valve covers a little about once a month.
As stated above, the older engines just used down tubes, and this is no different.
However, the statements about running a lot of miles, and the condensation that will form in the bottom of the engine is very valid.
I may change at some point, but am happy with it as is now.
Good luck, and let us know what you do.
Cheers.............

 

The draft tube equipped engines had a breather that let fresh air in, and the draft tube pulled the yucky blowby g***es and air out. Carmakers have known for a very long time that crankcase ventilation is important. The PCV system is a positive way to ventilate the crankcase.

 

PCV valve hooked up to full manifold vacuum = less oily mess everywhere.

 

the text book answer.

The blowby vapors that end up in an engine's crankcase contain moisture as well as combustion byproducts and unburned fuel vapors. The crankcase is sealed to prevent the escape of these gases into the atmosphere, but the vapors must be removed to prevent oil contamination that leads to sludge formation. The positive crankcase ventilation (PCV) system siphons these vapors from the crankcase and routes them into the intake manifold so they can be reburned in the engine

 

could you make an adaptor plate to replace the road draft tube with a line to a PCV valve and then right to the intake? that way you dont have to molest your valve covers. although i do like those moon breathers

 

Sure. That's what Chevrolet did in 1967. They replaced the road draft tube with a fitting to connect a hose leading to an inline PCV valve and then on to the carb base.



I cut off the tube and welded on a piece of tubing on my 58 Studebaker engine. It's hard to see but it is under the intake and plugged into the valley pan exactly where the road draft tube was mounted. Studebaker did the same thing but it's easier to find a bent up R.D. tube than the factory PCV piece.



I did the same thing on this 66 engine with an early 60s Edelbrock intake. The nice thing is that you can usually find a dented and rusted up R.D. tube cheap since you only need the top part that connects to the engine which is usually still in good shape.

 

not to hijack, but im running a 86 302 that i converted over to carb. the p***enger side stock valve cover has the fill tube, and a port for what i would ***ume to be a breather??? the driver side cover has no provision anywhere. the gt 40 heads on this motor "had" holes in the back that had some sort of tubing between the two which i ***ume was for some sort of equalization between the heads?? i could be way off, this whole engine thing is new to me. i just dont want to go and run my engine and mess something up because i didnt vent the valve covers properly. or can i just run it the way it is now? thanks

Jason

 

I cringe every time I hear the term "vent" when talking about PCV systems. They are not vents. Like Squirrel said they new back in the 40s that air needs to travel through an engine to remove all of the byproducts as shown in this old illustration with the airflow arrows. Fresh air needs to enter the engine somewhere and travel through the engine to a PCV valve connected to a vacuum source removing the nasty stuff. Keep this in mind when you come up with your plan.