Join Date: Jan 2005
Location: St. James, Minnesota USA
Re: How do you choose the right PCV ?
If you are running a big cam and don't have very much vacuum at idle, I'd choose a pcv valve from a factory car that had limited vacuum. When I was running a pcv valve, I got one from a 1970 Boss 302. The part number was the same for that car and some of the hot 427 powered cars from the 60's.
"? What is a PCV ? still trying to learn more, from you two, as you seem to know alot of stuff."
The pcv, positive crankcase ventilation, valve is used to help pull out gasses and positive pressure out of your engine via the valve covers. It pulls it out by vacuum (on the intake manifold or carburetor) created by the intake charge rushing into your engine, same as engine vacuum, or manifold vacuum, whatever you know it as. It is a valve so in-case the engine would backfire up through the intake, it can't get back into the valve cover where it could cause an explosion from the unburnt gasses. By not running a pcv valve, the engine will have excess positive pressure in the crankcase, the rings won't seal as good and oil will be forced out of gaskets and seals more easily. Hope that helps.
1982 F100 2wd-408c CHI 3V 225cc Heads, 3v Intake, Pro Systems 1000+HP carb, email@example.com w/ 0.694/0.697" lift solid roller, JPT Rollerized c6 and 5000 rpm converter, 4.86 gears and S&W Ladder Bar kit with QA1's all the way around.
firstname.lastname@example.org mph 1/8 mile with lots of bounce - with old engine and suspension(should be greatly improved)
1982 F100 408c 3v