Quote:
Originally Posted by decapello
Can you plumb a PVC valve through the intake manifold into the lifter valley, and keep your valve covers vent-less? As Ron61 said the pre PVC equipped engines had a pipe exiting the manifold and dumnping into the atmosphere. So, I'm wondering if I could drill through the manifold in an area that leads to the lifter valley, and plump the PVC from there. Is the lifter valley equalized atomspherically to the crankcase?
I got a nice new set of cast valve covers with no holes, and like the way they look. I really don't want to drill into them.
Thanks, Mike
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There are a couple of things that have changed since the advent of PCV's. One is that most early vehicles had a fill tube that wasn't into a valve cover. The early PCV conversions were just an adaptation to existing pieces, in other words they di have the PCV plumbed into the rear of the manifold and used the fill tube to give the proper flow. As it became standard equipment, they simplified the system and installed them into the valve covers, PCV and
oil fill. If you look at early engines, most have no holes, because they weren't needed. If you can add a fill tube to your manifold and have an access on the back for PCV, you can run "holeless" valve covers. The 2-4 factory intake on Shelby's have the oli fill tube and a place for the PCV to get plumbed in the back. An intake like that can easily be "correctly" fitted to use a PCV and not have holes in the valve cover. I put correctly in parenthesis because it took, I believe, 3 tries for Shelby to get it right on the '67 GT500s. That is according to SAAC and the pics they sent of the various ways to route them. Originally they had the PCV hooked to the fresh air nipple on the air cleaner and it was worthless...read previous comments regarding leaks. I don't recall, without finding the pics, what the second routing was. So, depending on intake or availabilty of a good fabricator, you should be able to accomplish what you want.