Aftermarket Valve covers (5.0 EFI)

DonMaximo · Jan 6, 2008

The stock drivers' side valve cover is full enclosed.
The stock passenger side valve cover has the filler tube, cap, and a tube line which runs to the Throttle body.

My new 347 crate engine came with oversized valve covers to accomodate the larger rocker arm assemblies. Each valve cover has an opening. The builder included a push-on breather on one side, and an oil fill cap on the other. The builder dynoed this engine using a carburetor, but I'll be using fuel-injection.

What changes, if any, should I make. I suppose I'm most concerned about the tube line which goes from the stock valve cover to the throttle body.

Any help would be greatly appreciated.

-D

408gt91 · Jan 6, 2008

Breather in one and oil fill in the other.Plug the throttle body.I have the same set up.

bloopbloob · Jan 6, 2008

there's nothing to be worried about. lots of guys eliminate the pcv system on the stock engine and just plug those lines and run a breather cap.

93 LX · Jan 6, 2008

Well in the EFI setup thr PCV is done in the intake not the breather anyway.

bloopbloob · Jan 6, 2008

93 LX said:
Well in the EFI setup thr PCV is done in the intake not the breather anyway.

stock efi's don't have a breather... just an oil fill. i always thought that the crankcase vapors were pulled back through the line from the filler tube into tb.... i know the pcv valve is in the manifold, but i'm not sure what you mean here.....

deftsound · Jan 28, 2008

I have aftermarket valve covers and there is just a plug on the passenger side instead of the pcv line that runs from the filler neck to the TB like on stock valve covers. Oil is slowly seeping out of the plug and burning on the header.

I have decided to put a breather in place of the plug. My question is what size breather would fit my ford racing valve covers? Are most of them universal?

88-378 · Jan 29, 2008

Ask the builder to swap out the covers for the correct EFI covers.

irish · Jan 29, 2008

If memory serves me right, if you have the stock pcv system intact, you should not run an open breather as that is a vacumn leak or unmetered air if you prefer and will mess up your air/fuel mixture. Couple places make push in breathers that are closed and have a vacumn nipple so you can reconnect it to the tb like stock was.

Matt

futura · Jan 30, 2008

I think 408gt had the right suggestion. Use the breather in one and the fill plug in the other, then plug the throttle body. If you're going EFI, the pcv is done from the back of the intake, like on the stock setup. I have tall valve covers to clear the Brodix head stud mounted rockers on my stock block, and I used Ford racing tall valve covers to clear everything. These came with solid cover on the driver side and filler neck with that tube connection to the TB on the passenger side, no problems. I think as long as you accomplish pcv through the stock style setup with the port on the intake, you will be ok with plugging the throttle body where the old filler neck tube connected.

PJC Racing · Jan 30, 2008

irish said:
If memory serves me right, if you have the stock pcv system intact, you should not run an open breather as that is a vacumn leak or unmetered air if you prefer and will mess up your air/fuel mixture. Couple places make push in breathers that are closed and have a vacumn nipple so you can reconnect it to the tb like stock was.

Matt

100% correct

deftsound · Jan 30, 2008

irish said:
If memory serves me right, if you have the stock pcv system intact, you should not run an open breather as that is a vacumn leak or unmetered air if you prefer and will mess up your air/fuel mixture. Couple places make push in breathers that are closed and have a vacumn nipple so you can reconnect it to the tb like stock was.

Matt

do you have a link to where i can get one of these?

1991vert · Jan 30, 2008

irish said:
If memory serves me right, if you have the stock pcv system intact, you should not run an open breather as that is a vacumn leak or unmetered air if you prefer and will mess up your air/fuel mixture. Couple places make push in breathers that are closed and have a vacumn nipple so you can reconnect it to the tb like stock was.

Matt

how is unmetered air going to get in there? PCV hole in the back of the lower intake should be plugged. so there's no way for unmetered air to get into the chamber.

i suggest welding an -AN fitting to each valve cover and running braided lines to a breather tank. last thing i would want is oil dripping down on my headers and starting a fire because those push in breathers will usually leak under higher RPM's

DonMaximo · Jan 30, 2008

Team,

For what it's worth, this thread has been very helpful to answering my original question. In response to the feedback, I've ordered parts and plan to do the following
#1 - purchased a non-breathing rubber plug for the driver's side V-cover.
#2 - purchased a push-in cap which is not vented, but does provide a vacuum hose lead to the TB.

This configuration should emulate and function exactly like the stock configuration and happens to be the least expensive solution.

Mission Accomplished !

Thanks again for all the replies.

Markus · Jan 30, 2008

Hello,

i use the tall aluminium ford racing covers on my restomod 67. I closed the driver side cover and use a breather on the p.side cover.

Aftermarket Valve covers (5.0 EFI)

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