I have an Edelbrock intake that seeps oil up through it in one spot. Is there any thing I can coat the underside with?
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Mike J
Unchartered DSRA Member
If it ain't broke, fix it anyway...

The casting probably has porosity. I'd try to take it back. I've never had any bad parts from Edelbrock but I've known others that have exchanged parts with no hassle, even if they were fairly old. If you have to fix it, try to find where the hole is on the under side and weld it shut. It will have to be cleaned real good.
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George

Are you sure it's comming from the bottom of the intake? It could be from the gasket surface if the manifold is a little crooked. Remachining the surface would fix it, but costs as much as a new manifold. (if it's a common one that is) Dave
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Life's too short to drive an ughly car!
Massachusetts Safety Inspecter for KKOA
www.geocities.com/stupidbaker57/custom_green

Have not seen an oil trail from a gasket surface. Just a small pool of oil in a low spot below one of the bolts. I have never seen any oil around the bolt. Old gasket looked good when I took it off.

George the manifold is 10 years old. I just port matched it. Hate to get another one now.I will clean it up good and see if I can see anything but its going to be really small. Might be able to peen it if I can find it.

The POR 15 won't brake down inside the engine?
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Mike J
Unchartered DSRA Member
If it ain't broke, fix it anyway...

That doesn't sound like porosity. You should check the gasket surface like Dave suggested and use good gaskets. Check the gasket and the surfaces for evidence of not sealing somewhere, especially from the bolt holes to the valley.
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George

If it is from seepage paint the underside with POR15 it will never leak again.
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Say what you mean and mean what you say. Be careful what you ask for, you may get it!

Ok, Heres a shot in the dark. Make sure you have a good working positive crankcase ventilation system. If not then pressure building up in the engine will find anywhere it can to get out, possibly around an intake bolt or by the gasket itself. If its leaking by an intake bolt and puddling on the intake, it is probably seeping out so slow that you wont see a stream from the bolt. I am having a similar problem on my 88 S-10 blazer and have decided to rebuild the engine because at 160,000 miles it has so much blow by that the crankcase pressure is looking for anyplace to excape since the pvc system cant handle all of it. One evidence of which is that even with a new PVC valve there is always oil inside the breather on the throttle body. One other suggestion...if everything is in good shape with the engine then get some copper washers like the ones used on the 3/8" studs that hold the 3rd member in on ford 9" rears and put them on the manifold bolts.
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KEEP THE GREAZY SIDE DOWN! Lobucrod

Sounds like you have oil weeping up the threads of the bolt.
Did you use a sealant on the threads when you installed the intake?
I always use liquid teflon on all intake bolts , specially chevy motors.
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Jeff Reid

No There wasn't. Will use some when I go back together. No obvious pin hole. No oil film in the intake. I did have an oil leak under heavy throttle. Coming from rear gasket on the intake. Going to use high temp silicone instead of a rubber gasket. Heads and deck has each been surfaced .008. Doubt if the manifold was. Part of problem? Hopfully just the sealer on the bolt. It's a very small seep. Just annoying.
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Mike J
Unchartered DSRA Member
If it ain't broke, fix it anyway...

.008 isn't much so I can't see that giving you any grief.
I work at a GM dealer and I always use the GM sealant for the end seals.
It seems to seal much better than the little tubes you get at aftermarket places.
I think it's worth the extra dollar and the good thing is that it comes in a silicone gun style tube and is reusable.
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Jeff Reid

i have had a new performer rpm weep oil through an unseen poris hole in a low spot beside a runner . after a number of miles it would get near 1/4 " deep. through the manifold, not gaskets, not bolts. it did it since new. vic and co. didnt even answer my complaint. on the other hand in other cases they have sent me 2 new manifolds to remedy a problem. so, i dont know. i just lived with it.
if it was me ....id pull it off,get the spot VERY clean, grind it and cover the area with j,b weld, alumn epoxy, someone mentioned por 15 , or what ever. weld it if you can find the hole.
good luck.
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pink rod ... tom

Mikej what gaskets are you running i had that problem once and after checking into it found i was useing Mr Gaskets gaskets and changed to Velpro and it quite......Johnny
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A GOODGUYS REP

Carquest gaskets. The ones I took off were also carquest. They looked good when I took them off.
Its got to be the sealer on the bolt or a small hole. I've got that baby clean and can't see anything. Going to get out my hand held microscope and take a closer look.
Will probably use some sealer underneath anyway.
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Mike J
Unchartered DSRA Member
If it ain't broke, fix it anyway...

that unseen hole probably opens up and weeps when it gets hot oil splashing all over. the hole in mine was also invisible.
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pink rod ... tom

Thud.... My hand was hitting the top of my head. Good point.
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Mike J
Unchartered DSRA Member
If it ain't broke, fix it anyway...