LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Best Header Gasket for LT1

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Old 10-16-2006, 10:01 AM
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Default Best Header Gasket for LT1

Tired of replacing these gaskets. I installed Split-Lock fasteners and their still blowing out. Whats the best gasket to use? Brand and part number please.
Old 10-16-2006, 10:06 AM
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if you are having that much trouble with the gaskets blowing, check the flanges and head surface to make sure you are getting a good seal.

Also check the header bolts shortly often to make sure they are all tight and that they stay tight.
Old 10-16-2006, 10:15 AM
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yeah i'd have your flanges surfaced by a machine shop and then get you some ultra-seals. I used them on my PS-Lt's and not one problem...EVER!
Old 10-16-2006, 10:33 AM
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Percy's deal soft aluminum gasket from autozone. That's the best gasket as far as I know
Old 10-16-2006, 11:00 AM
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Originally Posted by Ray@Nitrous Outlet
if you are having that much trouble with the gaskets blowing, check the flanges and head surface to make sure you are getting a good seal.

Also check the header bolts shortly often to make sure they are all tight and that they stay tight.
Maybe that's what causing my issue. Not checking them enough. Didn't figure I'd have too since I have split-locks. They are loose and I have carbon deposits all over the EGR connection at the header and on the gasket itself. This has always been a problem area. Bad design IMO. I think there should be a bolt at the top and bottom of that connection. The side without the bolt, always leaks. I might try doubling the gasket at that connection and useing some RTV.
Old 10-16-2006, 11:12 AM
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i use no gasket. a thin bead of red rtv,and they stay sealed up.
Old 10-16-2006, 11:20 AM
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i used mr. gasket ultraseals with my pacesetter longtubes, used these after the copperseals blew out been golden since
Old 10-16-2006, 02:04 PM
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Originally Posted by 94z28L
i used mr. gasket ultraseals with my pacesetter longtubes, used these after the copperseals blew out been golden since
What are you useing to seal the EGR connection to the header?
Old 10-16-2006, 06:14 PM
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I only have a few hundred miles on them but sofar Earl's Pressure master are the best I have tried.

Far as not checking because you have good bolts, well it is not the bolts that loosen the gaskets compress first which can lead to bolts loosning but the bolt loosening is a symtom not a cause.
Old 10-16-2006, 06:57 PM
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Originally Posted by asudecat
Percy's deal soft aluminum gasket from autozone. That's the best gasket as far as I know
Probly one of the best on the market next to copper. Both are more expensive than paper or graphite, but last 20 times as long.
Old 10-16-2006, 07:29 PM
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Originally Posted by mack
What are you useing to seal the EGR connection to the header?
oem replacement surprisingly is all
Old 10-21-2006, 12:53 PM
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the percys alum gaskets rule my g/f firehawk has them and now i need some i am putting them on my 94 Z
Old 10-21-2006, 03:49 PM
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Percy's . Put them on and forget about them
Old 10-21-2006, 04:09 PM
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Thanks



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