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How reliable are Cometic Gaskets for a Street Application

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Old Dec 29, 2005 | 10:47 AM
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From: Little Rhody
Default How reliable are Cometic Gaskets for a Street Application
I have been reading a lot about Cometics leaking. Are these reliable gaskets on the street?
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Old Dec 29, 2005 | 10:56 AM
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about 6-8k miles on mine so far. Been on two 1500 mile roadtrips
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Old Dec 29, 2005 | 11:01 AM
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If deck serfaces are straight and smooth they should not leak.

Nate
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Old Dec 29, 2005 | 11:04 AM
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I've reused mine Three times in three years never had a problem.
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Old Dec 29, 2005 | 02:28 PM
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If there gunna leak, you should notice it right away. Mine leaked, but I believe the deck surface was questionable. My new motor will be getting them.
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Old Jun 27, 2008 | 01:02 PM
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Bringing this back from the dead for more data, plus someone else is asking and was told by a shop that Cometics aren't made for a DD.
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Old Jun 27, 2008 | 01:43 PM
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Surface prep!! GM has OEM MLS gaskets.
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Old Jun 27, 2008 | 01:52 PM
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Cometics are just fine for a daily driven setup. We sell and install them on DD cars all the time. With the right surface prep (as required for any gasket) is crucial to ensure a good seal. I recommend putting a thin coat of copper gasket spray prior to install to help them seal. I personally have reused my head gaskets on my 408 twice now and they have held up to a 300 shot, no problem!

We carry several bore sizes and gasket thicknesses on the shelf. Let me know if you have any questions, concerns, or need pricing!

Jon
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Old Jun 27, 2008 | 01:57 PM
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Originally Posted by Jon@Texas-Speed
Cometics are just fine for a daily driven setup. We sell and install them on DD cars all the time. With the right surface prep (as required for any gasket) is crucial to ensure a good seal. I recommend putting a thin coat of copper gasket spray prior to install to help them seal. I personally have reused my head gaskets on my 408 twice now and they have held up to a 300 shot, no problem!

We carry several bore sizes and gasket thicknesses on the shelf. Let me know if you have any questions, concerns, or need pricing!

Jon
Texas Speed & Perf.
jon on cometic web site the gasket for a ls3. is .052 think. will this be fine on a boosted motor? in the 1000 rwhp range. (18psi, and nitrous to make up difference)
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Old Jun 27, 2008 | 02:09 PM
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I have over 30,000 miles on a set in my DD no problems at all...
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Old Jun 27, 2008 | 02:18 PM
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Yep, ^^^^

the point I was making is that a Cometic is a MLS . Multi Layer Steel and Gm uses MLS.
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Old Jun 27, 2008 | 03:30 PM
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No problems here as well. Deck surface is very important.
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Old Jun 27, 2008 | 04:17 PM
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No problems here, 30K DD.
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Old Jun 27, 2008 | 06:42 PM
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No problems here. I have around 3000 miles on mine. I think you'll be fine.
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Old Jun 27, 2008 | 07:26 PM
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No problems here. Over 8k miles and have been reused twice. I also sprayed them with a little copper sealant even though Cometic doesn't recommend it.
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