Hello everybody, i was thinking of buying a new carb spacer with a pcv port to hook the PB booster to and close the port in the back of the intake because the back cylinders  always run leaner than the front ones.
Would i get the same condition considering that the PCV valve is connectet to the back port of the Holley carb?

If you have a lean condition and you are sure it is from that port, then you have a vacuum leak.  Fix that and your problem will be solved.  Maybe the hose or booster itself is bad.
Moving the vacuum source will not solve that problem.



Lawrenceville, GA

Just to add to Charlie"s comments. Are you running the correct PCV valve? Others here have mentioned different valves, and even using a restricter in the hose to reduce the "vacumn leak" that the valve is.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

The only time the PB booster is taking vacuum from the engine is when you step on the brakes and that is only a miniscule amount.As someone else posted,if you are running lean,it has nothing to do with your PB booster being run off of the rear port on the manifold.

 

Paul,

Boonville,MO

OK got it.I've found another pcv valve laying around,an AC DELCO cv774c wich has a smaller hole and a stiffer spring inside.I'll check for vacuum leaks on the booster side as well!

Is there a recommended PCV valve that fits into the Valley cover?
I have a valve in the cover now, but have no idea what it's from or whether it works.
The car is not running at the moment
Thanks
Jim

Jim, the PCV valve conversion kits that many of the T-Bird suppliers sell appear to use the valve and grommet from mid 60's 260/289; it is the right size to fit in the valley cover opening where the road draft tube is now (on T-birds) and has the correct flow for the engine displacement. Note most passenger cars had the breather on the side of the block; you need to plug this; our shop used to put a rubber stopper we sourced from a Lab supply company that oi l and gasoline did not eat up. FYI California started the smog valve thing in 1961, and most cars had to be converted and tested at an approved shop. Mine  works well. Later 292's and most medium and heavy duty trucks used PCV valves starting about the mid to late 50's. The screened oil filler cap is the source of clean air. 
WJ1943

For PCV valves being used in the valley covers, I use the Microgard 2322 PCV valve.  These fit nicely in the ‘HELP 42323’ rubber grommets which also fit the rear hole in the valley covers that originally used the road draft tubes or PCV valves at the back locations.  On those covers, I typically have to remove the ¼-20 threaded stand in the center of the hole to allow the PCV to be fully seated.

Lorena, Texas (South of Waco)

If you want to plug the Hole in the Block where the Road Draft Tube is, a small Cup Type Frost Plug can be tapped in and 2 Bolts plug the threaded Holes. I did mine that way. Can't remember the Plug Size off Hand.   

  

I used on the these when I blocked mine, guy on Ebay sells them.