PVC breathers on valve covers

[AJ/FormS]

Some of the old AFBs from 60s Pontiacs and Chevys actually had an adjustable bypass... The big screw in the middle.

Yes and 68 or 69 Mopar AVSs too.

 

[AJ/FormS]

I put a stock type PCV on my 360 with a XE268H cam and my idle went up and I couldn't get it down. Also, when I would turn it off it would diesel really bad.

I even backed the idle speed adjustment screw on my Holley 750 DP all the way out so that the throttle blades are all the way closed. No luck there either.

I played with 4 corner idle adjustment screws and that helped, but then couldn't start the car when cold.

So, I took the PCV valve off and plugged the port on the Holley. Maybe I just need a different PCV valve or something.

I'll take a wild guess; were you running a ton if advance?

 

[TrailBeast]

I'll take a wild guess; were you running a ton if advance?

Probably just a PCV with WAY too much flow.

 

[JoesEdge]

I'll take a wild guess; were you running a ton if advance?

That I haven't checked. Once I get my steering column back in the car and my interior done, I'll check the timing.

Probably just a PCV with WAY too much flow.

See that's what I was thinking it was. I'm going to try the Fram FV191 part to see if it tones down the idle. Last time I ran the engine, I just plugged the port on the Holley.