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I'd like to install a PCV system on my 1979 Ford F100 2WD with 302.
It currently has aftermarket valve covers with two breather caps that vent quite a noticeable amount of fumes into the engine bay and subsequently into the cabin.
I'm looking to eliminate or reduce this considerably, and it looks like a PCV valve was used in other engines to accomplish this.
From the looks of it, I could buy a valve cap such as this
and connect a hose to a manifold vacuum port on the Holley?
Diagrams I've seen have one hose going to a manifold vacuum port, and on the other valve cover a similar breather with hose going to a port on the intake filter.
I'd like to install a PCV system on my 1979 Ford F100 2WD with 302.
It currently has aftermarket valve covers with two breather caps that vent quite a noticeable amount of fumes into the engine bay and subsequently into the cabin.
I'm looking to eliminate or reduce this considerably, and it looks like a PCV valve was used in other engines to accomplish this.
From the looks of it, I could buy a valve cap such as this Edelbrock Valve Cover Breather and connect a hose to a manifold vacuum port on the Holley?
Diagrams I've seen have one hose going to a manifold vacuum port, and on the other valve cover a similar breather with hose going to a port on the intake filter.
All 1969/79 F100 302, 1975/79 F150 302 came with the PCV system, as did other I-6 & V8 engines beginning in 1966...except CA
He could get 1 of the caps for a grommet and put it in the right valve cover then to manifold vacuum with the PCV in the grommet.
Then the cap with a hose to the air filter.
Some filter bases have a knock and a hose fitting you screw to it. It goes to the air filter so filtered air goes into the motor.
If you cant get the hose to the filtered side of the filter you can get small air filters to fit the hose part or get a 2nd cap for a grommet and a filter to fit it.
Filtered air should be drawn into the motor.
Also note where the cap with the PCV is the valve cover needs to have a baffle in it where the cap goes or it can / will pull oil in.
Then when you check the oil level in say 200 miles and it has no oil you wonder where it went and you have no leaks?
You also WILL NOT see it smoke as it is burned.
After market valve covers are funny this way.
Dave ----
It doesn't matter which side gets what--just that clean air goes in one side and the PCV allows the fumes to come out the other side into the manifold, usually to the base of the carb via a spacer made for the job.
Hmmm,,,from what you read around here with no PCV your engine should have detonated like the bomb over Nagasaki. amazing.
The hose from the breather to the air cleaner is nice but no big deal. for the PCV make sure the hole in your valve cover is baffled and if it is just get a grommet to fit it . hook it to manifold vacuum and you're done.
Here's my 351W set up. Driver side is PCV going into carb. On pass side I just have a breather. Like you know, some breathers have a line going into the bottom of the air filter but mine does not. Pretty simple. Just get the right sized grommet for the PCV because the one for your driver side breather likely is too big
If you're getting excessive smoke or oil smell out of the valve covers, you could have worn seals/rings in the engine and if that's the case you're going to continuously fowl out your plugs if you vent it into the intake. You should have a compression and leakdown test done to see how healthy the engine is. If it's got worn seals or rings, you'd be better off running scavenging tubes into the exhaust, or just run the valve cover vents down under the truck with road vent tubes.
I ended up finding a PCV valve, grommet, and new breather at a handful of local stores. The only thing I wasn't sure of is the placement of the hose on the PCV valve itself. It had two ports, one larger, one smaller. The smaller one more or less matched the diameter of the vacuum port on the carb so I went with that and plugged the larger hole. Not sure if that matters or not.
OK did a quick search after posting this, since I figure this is probably able to be verified. Looks like the top port is for purging, bottom larger port is actually for the vacuum. I went and purchased larger diameter vacuum hose and connected it to manifold vacuum on the Holley with a clamp.
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