[Lugnutz65]

Originally Posted by Mthumphrey

OK guys. I currently have a stock 250 until I get the headers and intake installed. It has one of those air cleaner looking breathers on the stock valve cover and a PCV valve on the back side. I am getting a lot of blow back. I found that the PCV valve connector is all cracked and leaky which might explain a little oil leak I have been trying to fix. The question is... Once I fix the PCV valve connector, should I replace the air cleaner breather with a chrome breather or a cap? Cap or no cap is the question?

I searched a bit and have seen engines both ways. It would seem a cap would be best to close of the unit get a better vacuum in the system, but is there a reason a breather should be used in this instance?

Thanks!

Here's a pic of the 250 (1971) that's in my 1965 C10. I swapped a 1965 rocker cover for the 1971 cover. The 71 cover had an emissions vent that fed into the carb so the rocker cover may not look like yours. The 250 likes the breather. I will say that my 230ci had a cap instead of a breather, but everyone agrees that the breather is better.

Also notice the PCV hose has a 90 degree bend already molded into it where it connects. These are available from Truck and Car Shop. Works nice and I like the lower profile.