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Aftermarket manifold wont seal

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Old Jan 1, 2008 | 02:30 PM
  #1  
89TXIroc's Avatar
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From: Houston, TX
Car: 89 IROC 5.7
Engine: 357
Transmission: T-56
Axle/Gears: 3.73
Aftermarket manifold wont seal

Hey guys I have a TPIS Big mouth intake manifold and in the back, close to the tranny, i'm having a oil leak thats pretty nasty.

I have tried silicone as a gasket but it got blown out within ~2-3 months

Is there anything y'all have found that seals the manifold to the block better?
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Old Jan 1, 2008 | 04:59 PM
  #2  
89TXIroc's Avatar
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Joined: Oct 2007
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From: Houston, TX
Car: 89 IROC 5.7
Engine: 357
Transmission: T-56
Axle/Gears: 3.73
Re: Aftermarket manifold wont seal

Any Seggestions? Anyone?
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Old Jan 1, 2008 | 05:49 PM
  #3  
TIMMYS89GTA's Avatar
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From: ocklawaha FL.
Car: 81z-28,89gta,91z-28 03 1500
Engine: 355,L98vette tpi,327
Transmission: TH350/700R4/700r4/4l80E
Axle/Gears: 3;73/3;27/2;73/3;73
Re: Aftermarket manifold wont seal

what type of sealant have you used?
I have used black permatex on my intake installs instead of the rubber piece inc. with intake gasket sets and never had one leak on me yet.
Just made sure the block&intake were completely clean,put a small bead around the head side of the gaskets front&rear at the first and last intake ports,laid those in place then laid a nice fat 3/8" bead across the front and rear,set the intake on,tightened it down,and waited a few hours so I knew the sealant dried before starting
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Old Jan 2, 2008 | 09:06 AM
  #4  
RednGold86Z's Avatar
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From: Corona
Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: BP383 vortech, BP383, 5.7 TPI, LG4
Transmission: 4L60e, 700R4, 700R4..
Axle/Gears: 3.27, 2.73
Re: Aftermarket manifold wont seal

"The Right Stuff"

It won't fail.

and make sure your PCV and breather work.
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Old Jan 2, 2008 | 09:20 AM
  #5  
Viprklr's Avatar
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: Aftermarket manifold wont seal

Originally Posted by RednGold86Z
and make sure your PCV and breather work.
I use GMS. Gasket Making Sh.......from GM. It's just their version of RTV. I've never had a leak yet.
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