Air "should" be going into the engine through the filter and being sucked out through the PVC to the carb. If you have excessive fumes I would check that the filter is clean (not plugged) and that you have suction at the PVC. If all that is working it sounds like you have excessive blow-by causing your problem.

Start the engine and feel if you have suction at the filter. You should if PCV is working. Pull the PVC out of the valve cover and put your thumb over end. You should feel suction and hear valve inside shut. If you don't cover end the engine may quit.

Good luck

Ol'ford nutCentral Iowa

56 Vic w/292 & 4 spd.

"Total" fume control systems end up with that front vent closed and piped to the air cleaner. When the engine is pulling everything through the PCV into the intake plenum - the air being pulled into the vent is filtered by the air cleaner - or when the engine is venting enough pressure to actually outflow at the front breather - the carb takes it through the air inlet. 

 
 Steve Metzger       Tucson, Arizona

Is it best to vent these engines through the valley pan?  This is a picture of my marine engine.  The breather is the brass vent on the front of the engine. The PVC valve is in the valve cover.  I get quite a bit of fumes from the breather.  Would I be better off to place the PVC valve in the rear of the valley pan?

Cool. In case you ever need an application, my 88 Firebird with 305 TBI uses a 90 degree valve.


Lawrenceville, GA

Thanks John (& fellas)- When I finally accepted the fact that I had no choice but to use a GM valve (and 3/8" hose) + found a slick 1/2" to 3/8" straight adapter, everything finally fell into place. I've only a few loose ends to tie up and it SHOULD be ready to fire- I decided to hold off for warmer weather, though- I'm stoked..... /Duck

BOO- YA!!!

Duck:

I just looked at my supply of odd pcvs, I found one that is 90 degree, the end that plugs into a grommet appears to be 1/2" and the hose end looks to be 3/8.  It is AC # CV761C if it is in the right box.

John - "The Hoosier Hurricane"

I don't know if this might help but some Motorcraft & Ford PCV valves come with plastic nipples that go over the end that will make it a 90. D9ZZ-6A666-A (Ford) or EV98B (Motorcraft) might be what your looking for.

Dan      Kingman Az.      86409

Duck:

I seem to remember some mopars in the late '60s with right angle pcvs.  Don't remember the sizes.  I know you looked at the valves in stock at NAPA, maybe you can look in their book (if they have one) at the pictures of the valves.  They may have one available that you need, but don't carry it in stock.

John - "The Hoosier Hurricane"

http://www.y-blocksforever.com/forums/Topic24835-3-1.aspx?Highlight=pcv+valve+mod

Duck does this help?

1957 ________________ Ford

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Y Blocks, The New Flathead!

Glen- I wish it could be that simple. I've only approximately 2 1/2" of space between the shoulder of the valve and a big brass multi-tap vacuum fitting in the back of the intake. It would almost have to be a 90 degree valve, as I don't have the height required to put a fitting in the line in that little amount of space- (at least none of the fittings I have or have ever seen) I know this seems a relatively small issue, but It's looking like I can't use the 1/2" valve provided with the kit- I think I need a plan B... *EDITED TO ADD* I believe I'll just convert everything to the GM set up- The 3/8" valve is the same one used on a SBC, so it sould handle whatever my 312 will throw at it. Thanks for the help Glen, I appreciate it...

BOO- YA!!!