Thread: PCV valve for 327 mouse

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Hi all. I am new to this club.I run a 327 in my 38 chevy truck. It has 9:1 comp, a semi radical cam (Chet herbert c-4) torker manifold, Holley 650,and 194 heads.I plan to get some better 2.02 Aluminum heads for it soon. For now, my first question is do I really need a PCV valve and not just an oil breather?I seem to be pulling oil up through the PCV valve, which ends up mixing in the fuel making the engine smoke.I was told that running without a PCV valve runs the risk of blowing gaskets, which makes sense. If it makes any further difference, these heads hav dual spring valves, which did not allow the use of the umbrella seals. I suspect I might be getting some oil running down the valve guides and allowing oil in the fuel mix as well. What do the pros think? Thanks!

Vent your other valve cover

Hi Denny.
I don't know which PCV valve I would actually need. I know that there are several types with different vacum allowances. My valve cover has a baffle, although it is home-made, and should easily deflect any oil splash.Oil drains too small? Didn't think of that. I wonder if that is due to a possible earlier head.

to just find out if its the guides, put a breather on both valve covers and see, it wont heart anything. round track cars use only breathers and turn 6000 rpms or more all the time. like danny said though be sure the baffles are in the covers.

on my 327 I used a grommet from bbc valve cover pcv and it fit perfect in the road draft in the rear of the motor. then I silver soldered a 3/8 pipe fitting in the oil fill tube and screwed in a pcv valve and ran it to the carb. in the road draft hole I ran a tube to the under side of the air cleaner to suck clean air had work great and did not put any holes in the valve cover. Ed ke6bnl

seems like a lot to go thru when you can put a soft plug in the old tube hole(brass) so it won't leak, and run a set of late model valve covers...
What everybody is skirting around is that if you pull your pvc side with vaccum- then you need a cross vent from the other side to allow it to pull thru the crankcase, instead of FROM the crankcase.
Like I said........vent the other valve cover, you can get a vented cap for oil that will fit right in the knock-out, or you can just get one that already has one & bolt it on.
OR you can do what Ed did- that looks pretty sweet & clean.
I used Eldebrock covers on mine & they come with vent caps.

believe its gonna smoke some anyway without any valve seals. Some oil is going to get sucked by the intake valve. I think you might get by with no exhaust seals.