Crankcase Evacuation with the LT1 smog pump. How To:

[Chuck Leeper]

Thats a anti backfire valve. We used them on crankcase evac systems in the headers.

 

[grape of wrath]

Thats a anti backfire valve. We used them on crankcase evac systems in the headers.

Your exactly right, that's what I bought it for but never used it for that purpose. Just happen to work perfect for this application. Cracking pressure is so low you can blow through it.