400 intake leak
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Joined: Nov 2005
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From: florida
400 intake leak
I have a recently rebuilt 400 and I have an oil leak around the intake and the block behind the dizzzy. The spot where the intake touches the block. It puddles up in the dizzy hole. Some have said I should not have put the rubber gasket in and just put gasket sealent and let it dry. The leak is not under pressure so it not awful but I dont like to see it on a fairly new build. What should I have done?
I had qork gaskets too but opted for the rubber ones.
Thanks, Jdog
I had qork gaskets too but opted for the rubber ones.
Thanks, Jdog
Cargo Master
Joined: May 2003
Posts: 2,561
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From: Earth
I haven't had any luck with the rubber gaskets myself. The last time I replaced my intake gasket, I used the cork gasket with Permatex because the rubber ones were leaking like yours are, front and rear. Alot of people just junk the end gaskets and use a thick bead of Permatex on the front and rear.
The bad thing is, you can't just replace the ends if you pull the intake. If you are using the turkey pan gasket, you'll have to replace that too as it can only be used once. Look around your intake ports on that pan when you pull it and you will see why. There is a ridge that flattens out when you torque down the intake forming the seal between the manifold and heads. I use a combination of a cut down turkey pan and Fel-Pro intake gaskets.
The bad thing is, you can't just replace the ends if you pull the intake. If you are using the turkey pan gasket, you'll have to replace that too as it can only be used once. Look around your intake ports on that pan when you pull it and you will see why. There is a ridge that flattens out when you torque down the intake forming the seal between the manifold and heads. I use a combination of a cut down turkey pan and Fel-Pro intake gaskets.
Posting Guru
Joined: Dec 2002
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From: chicago burbs
you should not have put the rubber gasket in and just put gasket sealent and let it dry. the rubber gaskets suck . the cork gaskets suck. it is possible to get them and get them to stay in but it's just not worth it to me. just for grins i tried using the supplied cork pieces, they aren't thick enough to compress! they sat there loose after the intake was torqued to spec! i pulled the intake and doubled them up with an extra set i had from way back when.by letting the sealant set well i was able to get them to stay in but the double set looks to be too thick. never again pal, not even for a good laugh. i don't think it's funny at all, do you?
Cargo Master
Joined: May 2003
Posts: 2,561
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From: Earth
Originally Posted by grclark351
you should not have put the rubber gasket in and just put gasket sealent and let it dry. the rubber gaskets suck . the cork gaskets suck. it is possible to get them and get them to stay in but it's just not worth it to me. just for grins i tried using the supplied cork pieces, they aren't thick enough to compress! they sat there loose after the intake was torqued to spec! i pulled the intake and doubled them up with an extra set i had from way back when.by letting the sealant set well i was able to get them to stay in but the double set looks to be too thick. never again pal, not even for a good laugh. i don't think it's funny at all, do you?
Posting Guru
Joined: Dec 2002
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From: chicago burbs
this is an Offy dual port on a 351C. i imagine all manifolds could be a little bit different as to how much crush they have down there, it would also be affected by the type of gasket used on the sides. i have mr gasket fiber gaskets on it, so that might be lifting the manifold slightly, but how much really? that much i guess.
Freshman User
Joined: Dec 2005
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From: CENTRAL NEW YORK
I Have A Edelbrock 400 Manifold.it Leaked Alot At The Same Spot.i Didnt Read The Directions When Installing The Manifold And It Said Do Not Use The Rubber End Gaskets Or A Oil Leak Will Start.
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Freshman User
Joined: Dec 2005
Posts: 38
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I would have to agree with the rubber gaskets leaking on the intake. I have two broncos both with 400's and the edelbrock 400 intake, and in my experience the rubber always leaks, so I suggest going with the cork it's your best bet. Make sure to apply a little bit of rtv gasket maker at the corners and she should seal up nice and tight with no problems.
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