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Generation III Internal Engine
LS1/LS6 Head Gaskets

Generation III Internal Engine 1997-2006 LS1 | LS6

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LS1/LS6 Head Gaskets

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Old

Sep 18, 2006 | 09:15 AM

#1

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Staging Lane

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From: Chesterfield, MI

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LS1/LS6 Head Gaskets

Well I'm struggling with this one.....I'm putting on LS2/LS6 243 castings on my '99. Do I buy head gaskets for the '99 block or the '04+ heads? They are definitely different part numbers....The older ones even have different part numbers for left and right. GM has a kit with two gaskets for the 97-01 and two different ones for 02-04 in their performance parts catalog.....

Just struggling with the decision.....

HELP!

Ray

Old

Sep 18, 2006 | 09:36 AM

#2

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From: north, ms

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Match gaskets to the heads, not the block

Old

Sep 18, 2006 | 10:10 AM

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From: Kansas City Area

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get the newer style mls gaskets.

Old

Sep 18, 2006 | 10:18 AM

#4

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From: Caledon East, ON

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Quote:

Originally Posted by mr2guru

get the newer style mls gaskets.

What is the thickness and part number for those?

Old

Sep 18, 2006 | 01:13 PM

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Quote:

Originally Posted by warp10

What is the thickness and part number for those?

12498544, not 100% sure on the thickness but I think it's .054

Old

Sep 18, 2006 | 01:44 PM

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Quote:

Originally Posted by muncie21

12498544, not 100% sure on the thickness but I think it's .054

THX.

This is quite thick actually. They dont have a .040 or a .042?

Old

Sep 18, 2006 | 02:08 PM

#7

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Ive seen a lot of people use the Cometic .040 gaskets

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Old

Sep 18, 2006 | 03:57 PM

#8

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Staging Lane

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From: Chesterfield, MI

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Thanks for all the replies. I've read some questionable things about the Cometic MLS gaskets.......Sooo I think it's the newer 12498544's for me!

Ray

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054, 12498544, gasket, gaskets, head, ls1, ls6, mls, swap

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