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how to seal intake manifold

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Old Mar 2, 2011 | 02:17 PM
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Default how to seal intake manifold

i've installed intakes w/ and w/o the end cork gaskets.

both methods work ok but can develop a small leak at block/head corner over time.

what is your favorite method to seal intake manifold?
Old Mar 2, 2011 | 02:29 PM
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Ive had good luck with RTV on those ends/corners!
Old Mar 2, 2011 | 02:34 PM
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Originally Posted by boeing747arowair
Ive had good luck with RTV on those ends/corners!
w/ or w/o the short skinny end gaskets on the block?

last time i left those gasket off and used 1/4" RTV. did pretty good. after a few years it started weeping ever so slightly.
Old Mar 2, 2011 | 02:36 PM
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001 Ive only done it with out the gasket. coat it well somewhat create a "dam"
Old Mar 2, 2011 | 02:43 PM
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last time i installed timing cover i used the short cork gasket on the oil pan w/ RTV; it didn't leak.

i'm tempted to install intake w/ all gaskets and all rtv to see how it holds up.

i have never tried all rtv on all intake manifold gaskets b4.
Old Mar 2, 2011 | 02:46 PM
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Shouldnt have a problem though everytime i have used cork I use Permatex Copper Spray a Gasket. Never had a problem with that

http://www.permatex.com/products/Aut...ve_Sealant.htm
Old Mar 2, 2011 | 03:15 PM
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starting to come back to me.

i recall hearing that a slippery cork gasket could pop out while torquing intake.

not sure if that's a pretty wives tail or not.
Old Mar 2, 2011 | 03:28 PM
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yes ive heard that plenty a times
Old Mar 2, 2011 | 05:05 PM
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If i remember right in the directions for installing a edelbrock manfoid it says not to use the end gaskets instead use rtv
Old Mar 2, 2011 | 07:16 PM
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Coating the cork (or rubber) end gaskets with RTV will make them slide like a well lubricated bearing pad. I use the end gaskets, a dab of "Ultra-Blue" in the corners and a thin coat of Loc-tite #518 top and bottom of the gaskets. the 518 will cure very quickly as soon as there is no air near it - the exact opposite of RTV. The "Ultra-Blue" is more oil resistent than standard RTVs and will maintain a seal longer. The 518, if given 30 seconds to cure, will not let the end gaskets slide around. I also use 518 around the water and port openings (.010" film) just to give extra protection against leaks.
You should always have clean and slightly roughened surfaces whan using gaskets.



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