pvc on tunnel rams?

[GJCAT427]

The sheetmetal manifold I`m building as of now has no provision for PVC. I can add a hole and fitting if needbe. I also have a rear vent tube like the cobras had that I can bolt to Jays adapter or I can put a fitting under the Dominator flange. I think that I will run valve covers with oil fill holes as Jays Tunnel Port adapter doesn`t have an oil tube hole. Need suggestions.

[Joe-JDC]

Most folks run the valve cover to header evacuation system with sheet metal intakes or vacuum pumps.  If it is a tunnel ram for the street, you can add a fitting like any other intake to the back of the plenum of the top half of the TR.  Some folks add a fitting between the carburetors on the top plate.  Whatever works.   Joe-JDC

[cammerfe]

Just a friendly FYI. PVC is usually meant to stand for Poly Vinyl Chloride, a sort of plastic such is used in some kinds of plumbing pipe. PCV is a Positive Crankcase Vent which is used to get rid of oil fumes in the inside of an engine.

KS

[My427stang]

If this is street/strip, I would just pick a point on the plenum, maybe smack on the rear where you can't see it and weld in an NPT bung and put an NPT/ 3/8 barbed fitting.

If it's race only, I'd probably just put big breathers on it and no PCV, or better yet as Joe said, header EVAC or even vacuum pump.  Being at WOT the PCV won't do much

I am a PCV fan on the street though

[GJCAT427]

Cammer FE, I should have proof read my post better! I do know the difference between PVC & PCV! Dam eyes get crossed with age when typing! I guess this motor will be both street & strip so I will weld a bung in some place on the back. I`m trying to keep it clean in looks when its installed. I`m going to shoot Jay some shots of it to post tonight. The 4500 looks like a 4 bowl toilet on top! I think the whole piece looks good though.

[babybolt]

They do make plastic PCV's now, so it could be a PVC PCV.  Though back in the day, some Ford engineers called plastic stuff CPS; cheap plastic s***.