1978 Pontiac 400 (oil exiting engine at high RPM) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-19-2010, 03:08 PM
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1978 Pontiac 400 (oil exiting engine at high RPM)

I've seen a couple posts but their really old so i want to start a newer one.

I have the 78 pontiac 400 engine blowing oil out the dipstick or valve covers at high RPM but not low RPM. This engine is in a 1940 Chevy Truck

This engine is new to me so i'm unsure if certain connections are correct.

I've read the PCV or other harsher problems could be the culprits.

I'm starting with the PCV and what I've done thus far was to blow into it and it did not blow through I then pulled air through it and it did let air escape from the case. This hose is hooked onto my 650 carburetor onto the back lower middle stem.


any tips on this engine would be appreciated.

best
nick

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Old 04-19-2010, 04:43 PM
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If you have the PCV plummed to a good vacuum port, then I would say that you have worn rings, valve guides, or both.
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Old 04-19-2010, 04:55 PM
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vacum port

speaking of that... the round piece that surrounds the PCV on the engine block can be moved clockwise and counterclockwise about a half turn each way.

also the PCV valve is not very snugly connected (it is a bit loose)

I tried to pull the PCV valve out but couldn't figure it out and I didnt want to break it. How do you get that damn thing out?

do you think the looseness would have any affect?

thanks so much for the post!
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Old 04-19-2010, 05:38 PM
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Pontiac engines are known for that valley pan grommet drying out and cracking thus creating more of a vacuum leak for PCV than anything else. I would recommend replacing the grommet and the PCV. Warrior racing out of Wayne MI or Jim Butler performance have them. Then make sure both valve covers are vented properly. You have to have airflow both ways. Also being that PCV's are connected to manifold vacuum they only work at idle and constant hwy driving. So at full throttle there is no evac at all. So by installing a vacuum pump evac system or an exhaust scavenger system you would have constant evac at all RPM. Also worth noting the Moroso vacuum pump running on a 455 netted 15hp on the dyno.
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Old 04-19-2010, 05:43 PM
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As for removing the grommet. They are a tapered grommet much like a firewall grommet, the problem is that when they get old and dry like that you will likely break it half then drop the bottom half in the lifter galley. What I do is get a heavy duty hook like the ones made out of the same size material as a medium screwdriver and pull it out from the inside of the hole. that way you wont loose that piece and have to remove the intake and valley pan.
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Old 04-19-2010, 05:43 PM
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How do you?

How do you take it off? Do u just pull the pcv out? Is the grommet screwed on or?

Thanks for the info!!
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Old 04-19-2010, 05:50 PM
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its just a nipple. They pull out but they get really hard to pull when that grommet gets hard like yours has. Like I said before make sure you don't loose the bottom half of that grommet down into the motor.
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Old 04-19-2010, 06:03 PM
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This is a photo of a new grommet from BOP engineering. Be careful to buy the right grommet as the groove is much wider than a valve cover grommet and will not work.

http://www.bopengineering.com/pontia...nt_parts.shtml
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Old 04-19-2010, 06:47 PM
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IIRC, if the grommet falls apart on removal, the bottom half will not actually fall all the way through to the lifter valley, but will be caught between the top and bottom of the valley cover.

Obviously still best if the whole thing can be removed.
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Old 04-19-2010, 07:54 PM
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Thanks

Thanks guys I'll give it a shot!
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