[Formulajones]

Originally Posted by Formulas

I dont have the part numbers in front of me but i tested from memory a Pontiac and a SBC PCV valve both clean and new you can simply put to your mouth to test, ... you dont have enough lungs to close the valve but all you have to do is push the valve closed and you can get a comparitive feal for how much air is passing..

the SBC valve passed far less air than the Pontiac one

Yes, this brings up a point that many miss. Physically many of the PCV valves look the same but there are many different ratings on them depending on application intended. If you look through the book they have a different PCV part number for all kinds of different OEM engines from the 60's through the 80's. I remember when PCV's used to just hang in the "help yourself" section and everyone would just grab one that looked like it would fit.

For instance, my Chevelle takes a PCV valve that looks like this one

https://shop.advanceautoparts.com/p/...003/12448224-P

Problem is, there are literally more than a dozen PCV's that look like that, and they all don't flow the same. Now if Wagner made one in this configuration which is the more common style and fits at least 5 different classic cars I have here, I might be willing to try one for giggles and experiment a little bit.