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Which 3.910 Cometic gasket? x3 part numbers

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Old 11-26-2013, 11:21 PM
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Question Which 3.910 Cometic gasket? x3 part numbers

Thought ordering this would be easy until I found 3 part numbers for 0.045" 3.910 cometic gaskets:
- C5788 (Darton)
- C5475
- SDL391045

Gaskets look different from the supplied pictures, and they all have different prices. So which is correct for a 2002 ls6 block with ETP 215 heads?
Old 11-27-2013, 09:28 AM
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Originally Posted by SilverSmoke
Thought ordering this would be easy until I found 3 part numbers for 0.045" 3.910 cometic gaskets: - C5788 (Darton) - C5475 - SDL391045 Gaskets look different from the supplied pictures, and they all have different prices. So which is correct for a 2002 ls6 block with ETP 215 heads?
I'd check with either Ed at FTI or call Mast Motorsports.
Old 11-27-2013, 10:35 AM
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I find the catalogs helpful...

http://www.cometic.com/catalogs/automotive/index.html
Old 11-27-2013, 06:19 PM
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C5475-045 per the catalog
Old 11-29-2013, 04:17 PM
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Originally Posted by LS1MCSS
C5475-045 per the catalog
^^ this is correct.
Old 11-29-2013, 09:20 PM
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Originally Posted by LS1MCSS
C5475-045 per the catalog
This is the same as the SDL391045. There are two different numbering systems, same gaskets

They are discounted during our Thanksgiving sale: https://sdparts.com/details/cometic-gaskets/sdl391045
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Last edited by Scoggin Dickey; 11-29-2013 at 09:28 PM.
Old 11-30-2013, 08:39 PM
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Better measure the chamber before ordering. In many cases the chamber will determine the gasket, not the bore.
Old 11-30-2013, 08:51 PM
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Originally Posted by vettenuts
Better measure the chamber before ordering. In many cases the chamber will determine the gasket, not the bore.
Exactly. That's why I said call Mast or Email FTI.

Take the AFR 245's for instance. They fit a 4" bore all day long. But they REQUIRE a 4.2" gasket.
Old 12-02-2013, 06:31 PM
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Originally Posted by Scoggin Dickey
This is the same as the SDL391045. There are two different numbering systems, same gaskets

They are discounted during our Thanksgiving sale: https://sdparts.com/details/cometic-gaskets/sdl391045
Thanks!!! This clears up any confusion moving forward with same dilemma as me lol! Placed order too!
Old 12-02-2013, 06:32 PM
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Originally Posted by dr_whigham
Exactly. That's why I said call Mast or Email FTI.

Take the AFR 245's for instance. They fit a 4" bore all day long. But they REQUIRE a 4.2" gasket.
I already had 3.905's with the ETP's. Cylinders are honed now to 3.905, hence the upgrade to 3.910's.
Old 12-02-2013, 07:25 PM
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I got some 3.910.040 for sale



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