Ls6 head gasket
Thread Starter
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
Ls6 head gasket
Can someone confirm before I place an order that this is the exact size stock head gasket for an ls6? Thanks
https://www.summitracing.com/parts/nal-12589226
https://www.summitracing.com/parts/nal-12589226
Last edited by bwill03z; Mar 16, 2018 at 03:30 PM.
Racer
Joined: Mar 2016
Posts: 437
Likes: 39
From: PA
3.910" bore size is what you are after, stock thickness is .054" or .051" depending on where you look. GM Part# 12498544 is for pair of factory gaskets for LS1/LS6.
I do suggest considering running some Cometic .040" gaskets, part# C5475-040 . They are more expensive but they will bump the compression ratio up from the stock 10.5-1 to ~10.86-1 while also obtaining a more ideal quench distance. I figure might as well get a benefit while in there. I did that with mine rather than going with a stock thickness gasket. Just be aware of PTV distance if you already have milled heads and a large cam, etc. etc.
I do suggest considering running some Cometic .040" gaskets, part# C5475-040 . They are more expensive but they will bump the compression ratio up from the stock 10.5-1 to ~10.86-1 while also obtaining a more ideal quench distance. I figure might as well get a benefit while in there. I did that with mine rather than going with a stock thickness gasket. Just be aware of PTV distance if you already have milled heads and a large cam, etc. etc.
Thread Starter
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
3.910" bore size is what you are after, stock thickness is .054" or .051" depending on where you look. GM Part# 12498544 is for pair of factory gaskets for LS1/LS6.
I do suggest considering running some Cometic .040" gaskets, part# C5475-040 . They are more expensive but they will bump the compression ratio up from the stock 10.5-1 to ~10.86-1 while also obtaining a more ideal quench distance. I figure might as well get a benefit while in there. I did that with mine rather than going with a stock thickness gasket. Just be aware of PTV distance if you already have milled heads and a large cam, etc. etc.
I do suggest considering running some Cometic .040" gaskets, part# C5475-040 . They are more expensive but they will bump the compression ratio up from the stock 10.5-1 to ~10.86-1 while also obtaining a more ideal quench distance. I figure might as well get a benefit while in there. I did that with mine rather than going with a stock thickness gasket. Just be aware of PTV distance if you already have milled heads and a large cam, etc. etc.
Racer
Joined: Mar 2016
Posts: 437
Likes: 39
From: PA
I checked your link...the 12589226 part number is for a single head gasket and 12498544 is for the pair. Oddly enough, the pair is only a few bucks more. Either one will work, might even be the same.
Last edited by wrkdWS6; Mar 16, 2018 at 04:07 PM.
Thread Starter
Melting Slicks
Joined: Nov 2011
Posts: 3,183
Likes: 265
From: Virginia
That is strange that the pair isn't more than the single. Thanks though I will go with the 12498544
