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Old 08-16-2010, 02:15 PM
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Best intake gaskets

Well i had a smoking issue with my chevy 350 which i have found out was the intake manifold gaskets. They were felpro gaskets and became oil soked and pulled oil in the intake stream. I ordered edelbrock gaskets but they did not come with the end gaskets so i used black rtv. Well the smoke issue is gone but now the back of the intake is leaking. What would be the best way to solve both problems. Thanks
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Old 08-16-2010, 02:23 PM
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You need the rubber gaskets for the front and rear. There is no substitute for a gasket where there needs to be a gasket.
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Old 08-16-2010, 02:32 PM
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No one uses those end gaskets. Gm doesn't even supply them anymore, they include a tube of RTV. You need a 1/4"-3/8" thick bead at the front/rear. Then let it set up 20-30min. before installing the Intake. Surface must be clean = NO oil before applying RTV. Also put a small/thin bead around water ports on side gaskets.
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Old 08-16-2010, 02:43 PM
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Quote:
Originally Posted by SSedan64
No one uses those end gaskets. Gm doesn't even supply them anymore, they include a tube of RTV. You need a 1/4"-3/8" thick bead at the front/rear. Then let it set up 20-30min. before installing the Intake. Surface must be clean = NO oil before applying RTV. Also put a small/thin bead around water ports on side gaskets.
I do the same never had a problem... the only problem I'v had is using the gaskets and having the rear pop out....
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Old 08-16-2010, 05:40 PM
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Well i will reorder the intake gaskets. Now if i dont need the front and rear gaskets then what is the best way to use rtv and do it right. There are holes were the gaskets go should i just rtv around them or put some in them. This is my second time doing this and i dont want to do it again. Thanks
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Old 08-16-2010, 06:10 PM
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If you are talking about the small holes on the surface where the end seals go. They are there to locate the seals. Just apply the thick RTV bead over the top of them, they will fill when the Intake is set in place.
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Old 08-18-2010, 06:03 PM
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The best intake gaskets are the ones that match you intake ports on your heads. What does the head manufacturer recommend?

Has your block been decked, heads cut? This may affect how the intake gaskets fit.

FelPro makes different intake gaskets based upon intake port size. They also make thicker than stock intake gaskets.

What heads are you using, what intake, and what FelPro number gaskets failed?
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Old 08-18-2010, 06:35 PM
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The block was not decked as far as i know. Im using a set of 882 heads with an edelbrock rpm performer intake. The first set of gaskets came in a complete gasket kit from felpro.
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Old 08-18-2010, 07:50 PM
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Try using the Print o Seal style gasket.
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Old 08-19-2010, 04:07 AM
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Ok i am thinking of trying those printoseal gaskets. They do come with the end gaskets too. Now will they work with an aftermarket intake and not leak? Just so i know what port size would the 882 heads have.
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Old 08-19-2010, 05:16 AM
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Look for a FelPro #1256 or the Mr. Gasket equivalent like their #5820. Both these gaskets fit stock size/location ports.
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Old 08-19-2010, 07:03 AM
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Throw away the end gaskets. Clean the ends well with brake clean on a rag to get rid of all the oil. Lay down a 1/4 thick bead of black RTV, be sure to set the manifold straight down so you don't wipe the RTV off. Depending on what configuration intake you have, sometimes you can install a couple studs to help with initial alignment. I have done hundreds this way and they will not leak. No one who has done this for any length of time uses the end gaskets, they just don't work.
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Old 08-19-2010, 07:10 AM
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X2 Even the OEM's quit using the end seals- they use a material like "Right Stuff". FelPro ships their gaskets w/their black RTV- works great. Once you've done one right w/the RTV you'll never go back to those damnable end seals.

Does anyone besides me remember when there was no RTV? Then, it was pretty much Permatex #1, #2 or #3.
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Old 08-19-2010, 08:25 PM
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Well if i really dont need the end gaskets them maybe i will use a set of edlebrock intake gaskets. I really liked the last set so maybe ill give them another shot.
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Old 08-19-2010, 10:47 PM
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Quote:
Originally Posted by cobalt327
X2 Even the OEM's quit using the end seals- they use a material like "Right Stuff". FelPro ships their gaskets w/their black RTV- works great. Once you've done one right w/the RTV you'll never go back to those damnable end seals.

Does anyone besides me remember when there was no RTV? Then, it was pretty much Permatex #1, #2 or #3.
Oh Yeah, don't forget Indian Head, which I still use today.
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