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So I'm mid swap putting in 302 H.O. into my 89' F150. I'm a little unsure of how to plum the PVC system, and don't want to mess this up and hurt the longevity of my new engine.
My after market valve covers have a grommet on one side (to receive PVC valve?) and a nipple on the other side at the oil fill stem.
There is a grommet on the lower intake manifold (GT40 style) and one on the aftermarket TB, and a few on the upper manifold.
I have read that with EFI using a breather or vent on a valve cover can cause a lean condition from the fresh air entering behind the MAF.
So right now I plan on going from passenger side valve cover to PVC to lower manifold, then from driver side cover to TB, meaning I would cap all other unused vacuums on the manifold? (Just relating to PCV)
You just don't want to motor getting unmetered air. You're right, the valve cover to the throttle body. There should be a hole in the lower manifold right at the rear for a grommet and that accepts the PCV valve which also be routed to one of the larger ports coming off the bigger part of the upper plenum.
I think look for some pictures of how the Mustang routes them as the lower is just like them even though the upper is flipped for a truck. It would just be reversing the upper fittings from the way the Mustang runs them I would think.
You just don't want to motor getting unmetered air. You're right, the valve cover to the throttle body. There should be a hole in the lower manifold right at the rear for a grommet and that accepts the PCV valve which also be routed to one of the larger ports coming off the bigger part of the upper plenum.
I think look for some pictures of how the Mustang routes them as the lower is just like them even though the upper is flipped for a truck. It would just be reversing the upper fittings from the way the Mustang runs them I would think.
Gotcha, didn't realize that the rear PCV vents through the lifter valley and not a valve cover, which makes sense because it can draw from both sides.
I will however need to cap the passenger side valve cover grommet; I wont run a vent because that would draw in un-metered air behind the MAF.
I'm considering an oil separator to keep oil out of the intake, but that3 will have to wait until I get her running.
Oil separators are good but I'm hoping that your intake had the plate under it to keep oil from getting into the valve.
It has a huge baffle plate, and I assume with the large void that is the lifter valley, it wont be an issue. It's the mustang guys saying how much they collect that makes me want to do it in the future.
I think Mustang valve covers only have the one longer fill neck which attaches to the throttle body. I think the other is totally closed.
Correct, passenger side had no port so I'll be capping mine with a plug.
Next is for me to understand the evap system I took off to get out of the way. From what I'm reading its important for emissions, safety and efficiency.
05-17-2016, 07:26 AM
