Guys I was having a prob sucking oil into my pcv valve then into the back of my demon. Of course there was no baffle so I got a moroso gromet w/ baffle and gonna try another pcv valve. What one should I try?? Like off of a 70 camaro with a 350 ?? I Assume something with higher compression and Hp numbers would help... What I am asking are all the equal or are there differances?? If diff which should I buy???


Brian

Yes there are different types. I think the 70 LT1 is the one to use for perfromance engines, but not completely sure here, anybody?
Matt

anyone else???

Id bet the one for the Z28 350 and an LS6 is the same part number. Use the one for the LS6, and you'll be fine. Its the same one as a lot of other chevy PCV part numbers, at least in the Fram catalog.

1969 Corvette 427 435 hp seems to work well. I took the 90 elbow off the small block one I had been using. Funny, those PCV are quite different between models.

I believe I used that '69 Vette 427/435hp on my lowish vacuum small block. It seems to work fine. No oil leaks and idles choppy (as it should), but nice.

I had to take the PCV valve and heat it up a little to slide the plastic elbow off. Can't remember, but I might have just soaked it in hot, hot water for a minute or 2. Then I was able to slide on my old elbow, so it would physically work in my application.

I had to get a Carquest part # for the '69 Vette PCV valve, cuz none of the other parts lines in my area had one.

The Moroso baffled grommet is your problem; I've never had one NOT suck oil.

There are two types of baffled grommets I have encountered; the more common one has a simple slit on the bottom, and the other style has 3 tiered "steps" at the bottom. Neither does a very good job in terms of oil control, but the stepped one works a little better.

The best way is to install a proper baffle on the valvecover.

Troy

There you have it! Good call Troy.

Originally posted by Gokou:
The best way is to install a proper baffle on the valvecover.

Troy Just for my knowledge, where can a proper baffle be obtained. Are they an off the shelf item at an autoparts store? Thanks.

Not all valve covers come with a "proper baffle" and there are not many "proper baffles" on the market... If you didn't get a baffle with your valve covers you will have to improvise. The 3 tier Troy speaks of is the better of teh two gromet style. I didn't get baffles with my valve covers and drilled them for the PCV and breather and went on a 1900 mile trip and sucked 3 qts of oil into the base of the carb. This caused pinging and when I jumped on it you could see blue smoke out the back. Added the gromet (just to the PCV side) and within about 20 min the blue smoke quit out the back when jumping on it and I had no signs of detonation any longer. Haven't had to top off the last oil change either...

If your valve covers don't have any provision for a baffle you may be out of luck unless you fabricate something. I would love to see a fitting that screws together in the breather opening of the valve cover that has a gromet on top and a baffle on the under side...

You could buy a mopar style breather with tube and run the inline PCV that's hose barb on both sides 1/2 and 3/8. Most breather tubes are 5/8 but I think it will work. I'll let ya know in a couple hours.

I have seen these on Street Rods and the owners say they work great. No personal experince though they look like they might be the answer if your covers don't have baffles. http://www.billetspecialties.com/item.asp?cid=3&scid=4&pid=145

Just an FYI the Purolator PV736 is the PCV listed for a '69 Camaro Z28 as well as a '68 Chevelle 396 and I'd guess other performance engines also. Low performance small blocks carry a different part #.

who makes the three tiered baffle you guys talk about?? I hav e the moroso gromet that is long and has a slit in the bottom of it... I think part of my problem is my pvc is at the back of my valve covers, so I will turn them around and put it at the front and see what happens..
I also purchased a pvc valve for a 435hp 427 for a 69 vett.


Brian

From the Camaro site... http://www.camaros.net/cgi-bin/forum/ultimatebb.cgi/topic/9/10874.html?

There's pic's and the Moroso part number 68772 is the one you want...

As for the breather with the port on the side for the PCV I don't understand how it works. A PCV system is a controlled vacuum leak. Engine vacuum pulls fumes from the crankcase on one side of the engine and draws in fresh air from the other. If their is a breather in line with the pcv valve the breather is the closest source of air to be pulled into the base of the carb not the crankcase. Also if any oil is being pulled through the PCV valve into the base of the carb it's just going to get trapped in the breather.

The Mopar style breather with the tube is sealed except for the tube opening.

so are the two baffles the same one accepts a breather and the other accepts a pcv?? All the pics I look at only show the one with the slot in the bottom the 775 I believe with a bottom pic... anyone know what the bottom of the 772 looks like???

Brian

Here's what the bottom of the 772's look like.
http://www.jegs.com/photos/7205425.jpg

as opposed to the 775 with just a slot...

and the 772 is possibly the better of the two??

Brian

Originally posted by 64chevlle:
and the 772 is possibly the better of the two??

Brian That was the advice I got and it's worked very well for my application...

if it is an issue of pcv pulling oil into the intake hence producing smoke wouldnt the line
from valve cover to vacuum bung be wet with oil on the inside.i'd hate to think that was my problem of smoke on the top end.i pulled my line off and it was totally dry.
shane

Originally posted by ovelle:
if it is an issue of pcv pulling oil into the intake hence producing smoke wouldnt the line
from valve cover to vacuum bung be wet with oil on the inside.i'd hate to think that was my problem of smoke on the top end.i pulled my line off and it was totally dry.
shane I had the same thing and thought it might be guides but when I pulled the carb the gasket was oil soaked right below the PCV.

Shane - My pcv hose, the valve and the base of the carb where the fitting is all had oil residue. It was very obvious oil was being sucked into the intake...

Shane,

My hose was not wet looking either but I had oil all around the PCV Vacuum port on my carb spacer and gasket. Smoke at start up......smoke at RPM.......smoke at decel, smoke is gone now but my gasket was all oily again. I made some changes that fixed most of it and I'm still trying a few things.

This time around I'm going to install a clear inline fuel filter for test purposes.

ovelle

did you ever lower your float level like i suggested in this post??

http://www.chevelles.com/forum/ultimatebb.php/topic/4/22773.html#000009

it doesnt bog off the line,doesnt run out of fuel
it just smokes at cruise at full throttle any speed but mostly full throttle..just cruising it smokes,makes your eyes burn (xhaust cut just before rear end)some stuff i have read says if you have to go 8-10 steps below stock jetting you have the wrong carb.67/74 jets and 4.5 pv. is what i have pink cam with 28 squirter also fuel pressure is at 6 psi according to gauge and floats are middle of sight glass i honestly think the float level is causing your smoke, from your descriptions in that post you have all the symptoms of a too high float level.

at least try it

oh yes lowered below sight glass.i did everything everybody suggested. in denial that i paid a lot of money for the final touch to my new mill i finally gave in and sent it back to the manufactuer,3 of the 4 boosters were crooked
(could slip a bic pen into one side and not the other).the main body was not drilled all the way,
were the fuel mix actually goes into the booster
2 of them were restricted about 10-15%.
we'll see what happens,,hopin' they'll make it right...
shane

forgot to add,pcv lines inlet and baseplate gasket are all oil free.
shane

hilljack,
fuel filter???excellent idea thank you
shane