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Suggest an oil filler for my ZZ6 crate please

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Old 09-11-2018, 08:30 PM
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Kie
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Default Suggest an oil filler for my ZZ6 crate please

My new turnkey small block came with a Mr Gasket chrome breather and grommet to use as the oil fill. It installs on the driver side valve cover and leaks like a sieve. Probably a more snug grommet as it fits in the valve cover would fix it but Iíd prefer just a dedicated oil fill cap.

Iím assuming I donít need it to function as a breather since I have a true pcv valve on the passenger side valve cover plumbed into the Holley.

Suggestions? Thanks !
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Old 09-11-2018, 08:32 PM
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Kie
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Brand new from The General haha

Appears to be leaking between the valve cover and the grommet
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Old 09-11-2018, 09:22 PM
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HeadsU.P.
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Yes you do need this "vent". If the PCV Valve is sucking nasty air out of the crankcase, how do you suppose fresh air will enter? This breather!
Go to Summit and check out breather grommets. I believe Moroso has a leak-free unit.
Also, is there a baffle under that breather?
Check and see if the grommet even has a hole all the way through. I have seen units that needed to be opened up with a knife.

Last edited by HeadsU.P.; 09-11-2018 at 09:23 PM.
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Old 09-11-2018, 10:56 PM
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Originally Posted by HeadsU.P. View Post
Yes you do need this "vent". If the PCV Valve is sucking nasty air out of the crankcase, how do you suppose fresh air will enter? This breather!
Go to Summit and check out breather grommets. I believe Moroso has a leak-free unit.
Also, is there a baffle under that breather?
Check and see if the grommet even has a hole all the way through. I have seen units that needed to be opened up with a knife.
Yes there is a baffle in both valve covers. Yes the grommet has a hole all the way through. GM gives you identical grommets for the pcv and the breather. For whatever reason it weeps on the breather side. For now I found a grommet at Orellys that seems to fit more snug.

I did not know you need to introduce fresh air into the crankcase area. I thought the pcv sucking rhe nasty air and making a ďvacuumĒ in there did nothing but good things. I had always thought that having as close to a perfect vacuum as possible was ideal.

Going to Summit now....
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Old 09-11-2018, 11:15 PM
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sambrand
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the softer the grommet the better the seal, they are not always identical don't ask me why cuz I don't know but I do know ive had 2 of the same brand that were different fits right out of the package, same with oil and trans dipsticks you can open two of them in the store and feel they are different even though there the exact same part,
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Old 09-11-2018, 11:30 PM
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Kie
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Ok maybe Iím being dumb. Looks like the grommets are in fact different and perhaps I reversed them. DOH !
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Old 09-14-2018, 08:02 AM
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The crankcase ventilation system is designed to pull air in through the intake breather on one side of the engine and pull air and vapors out the PCV valve on the other side of the engine. If the baffles are not there inside the valve covers, or you do not have enough air being pulled through the opposite side valve cover, the combustion gas that sneaks past the rings will blow out the intake breather and bring oil mist with it. Makes a mess on the valve cover. The PCV valve needs to be pulling full manifold vacuum during idle and cruise to make the system work so hooking it up properly is critical - need to verify that. During wide open throttle the system does not pull in vapors as the manifold has little vacuum.

Check to see where your PCV valve is hooked up. Make sure you have baffles inside the valve covers. You might consider adding a factory style intake tube attached to a proper crankcase intake filter in the base of the air cleaner. It is cheap, works much better - No more mess.

Last edited by stingr69; 09-14-2018 at 08:05 AM.
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Old 09-14-2018, 08:39 AM
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correct there are 2 different sizes, one for pvc one for breather, Try switching them
How do you like the ZZ6
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Old 09-14-2018, 02:17 PM
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ddawson
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That's pretty common with those style of breathers. Even modern day engines LSx motors will mist and make a mess during WOT runs.

If the PCV intake is routed to the intake :non vacuum" the mist will be sucked into the manifold. Otherwise its venting under your hood.

What air cleaner housing are you using?

Even the L88 was routed to the air filter.
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Old 09-14-2018, 03:59 PM
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Guys this is a new turnkey crate from GM so I have to assume the baffles and everything are as they should be inside the valve covers. I hooked the pcv up exactly as the the instructions said to. There is a port on the carb where the hose goes. I used the air cleaner that GM supplied for the motor.

I ordered the new grommet kit from Jegs that will be here Monday. Iím sure one of them will fix me up.

How do I like the ZZ6 ??? Love it! After sorting out the details it feels like it came this way from the factory. Starts/runs/operates like a champ. Idles just right at 6-700 with just a little cam ďrumbleĒ. Instant acceleration right off idle with no stumble and rips to 6k in a heartbeat. 405 hpís feels just about right in this old thing. The sound in the Battery Street tunnel here in latte land is ferocious!

Last edited by Kie; 09-14-2018 at 04:00 PM.
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Old 09-14-2018, 04:12 PM
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After confirming that the PCV valve is good.
With the PCV valve hose connected to Manifold vacuum, it should hold a tissue paper to the bottom with the engine at idle
Try moving the PCV valve to the drivers' (left) side and the vent to the passengers' side
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Old 09-14-2018, 05:36 PM
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Keep in mind that not all PCV's really do their job on every engine.

Something for you to look at IF you still and oil seeping. Jim corrected this same issue with this PCV

Not knowing if it really matters but generally the PCV goes in the front of the left valve cover and the fresh air breather intake is where you have the PCV currently.

https://www.corvetteforum.com/forums...pcv-valve.html

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Old 09-14-2018, 05:44 PM
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I use this one from Wagner, it works great and is MUCH better than the stock PCV recommended. It is a bit pricey, but worth the extra price IMO.
Wagner PCV

Last edited by Buccaneer; 09-14-2018 at 05:45 PM.
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Old 09-14-2018, 06:47 PM
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It never dawned on me to have the pcv on the driver side. The pcv port is on the passenger side of the Holley 770 so I figured the pcv itself should be on the same side of the engine. The engine wouldnít care which direction the vapors get sucked would it? It looks so sano plumbed the way it is now.

If it still weeps after I change the grommet Iíll try swapping them left to right.
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Old 09-14-2018, 07:27 PM
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Originally Posted by Kie View Post
It never dawned on me to have the PCV on the driver side.


That's the way GM did it.


This is looking at the front of the engine.
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Old 09-14-2018, 07:30 PM
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Hmmmm. The GM website shows my engine with the pcv on the passenger side and breather on the drivers. Although that ďbreatherĒ sure looks like nothing more than an oil filler. Weird.
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Old 09-14-2018, 09:11 PM
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I think I spotted the problem. Nothing wrong with the breather, nothing wrong with the grommet. Baffle is in the valve cover. That's good. However, I see a vacuum line off of the dizzy going to the front of the carb. I suspect the PCV hose is going to "Ported" vacuum. Is that what's going on?
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Old 09-14-2018, 09:42 PM
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Originally Posted by HeadsU.P. View Post
I think I spotted the problem. Nothing wrong with the breather, nothing wrong with the grommet. Baffle is in the valve cover. That's good. However, I see a vacuum line off of the dizzy going to the front of the carb. I suspect the PCV hose is going to "Ported" vacuum. Is that what's going on?
I will re-check my work tomorrow when Iím back from camping. Iím certain I double/triple/quadruple checked the connections. The installation guide from GM was very specific and clear where the 4 hoses (brake booster, dizzy, pcv and hvac vacuum) go.
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Old 09-14-2018, 11:27 PM
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Default pcv goes in passenger side v-cover on a ZZ6


I knew I did at least one thing right lol

Last edited by Kie; 09-14-2018 at 11:28 PM.
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Old 09-15-2018, 07:16 AM
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Now that I think about it, very few PCV hoses are hooked up to the front of the carb. Usually too small of port to do any good. As your instructions state, hook PCV to large port. Those are always in the back or a separate brass port off of the intake. I don't see a fitting on your intake.
Keep in mind, even a brand new engine will have built up crankcase pressure known as blow-by. I think that's what's happening at the grommet, its exhausting instead of a steady income of air.

Last edited by HeadsU.P.; 09-15-2018 at 07:20 AM.
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