Reply to "Mysterious Cleveland alu rocker valve train"

Sounds about right with a long duration cam. I think GP was closest to the answer with the lock nuts shortening the duration of the cam?

The only problem with 12in at idle is that the Pantera brake booster wants more.

I'm still playing with this but your set up is simpler. I have the Webers involved with a big cam and am trying to plumb in a PCV valve.

12in looks like the best I can do with it and is going to necessitate a vacuum pump.

I need to find a PCV valve that completely closes at idle. So far, no good.

If I disconnect the PCV I can get 14-15in-mg at idle and idle at 800rpm.

Not easy at all balancing all of these systems for the best combination. Webers were never intended to be anything but a racing set up and a race engine didn't need to power the brakes or a pcv system.

I may have to concede and go to a header scavenging system to vent the crankcase but I don't like sucking oil out of the valve covers and into the headers.

These engines do need to have the crankcase power vented in some way. You will develop phantom oil leaks without it.