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LS9 head gasket

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Old Dec 14, 2008 | 09:23 PM
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Default LS9 head gasket
Has anyone actually laid their hands on a set of these? It was brought up a while ago, but we weren't sure if the dowel holes were larger or if there were any other differences. No speculation please, just first hand info. Part number?
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Old Dec 15, 2008 | 11:25 AM
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Well I guess I am going to go stop by the dealership and see if they are available, and maybe get one coming to take a look at.
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Old Dec 15, 2008 | 12:42 PM
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The LS9 gasket part number is 12622033.
The dowel pins are the same as a regular LS1, so aside from having bigger 11mm bolt holes I can't think why it would need to be any different than the regular 6.2 gasket.
Let me know if your local guy will not order one for "inspection" and I will get one on the way.
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Old Dec 15, 2008 | 04:19 PM
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my buddy has a set in his hands right now. he measured then and they are the same thickness as the ls3 gasket but are 7 layers as opposed to 5.
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Old Dec 15, 2008 | 04:41 PM
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I ran them on my nitrous car, over 500 shot, great results.
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Old Dec 15, 2008 | 04:42 PM
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What is the bore diameter?
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Old Dec 15, 2008 | 06:18 PM
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I checked at the local dealership (they suck btw), and it is the part number you guys posted 12622033. He said they were not available, and no dealers showed having them???
Where are you guys getting them? Price?
How many layers are the LS7's? I can't remember for sure, 3??
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Old Dec 15, 2008 | 07:31 PM
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Hmm, I know 1/2" studs go thru the oe dowel pin so there shouldnt be any difference in the dowel size, just the bolt hole size. I'm also interested in this.
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Old Dec 15, 2008 | 08:40 PM
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Originally Posted by veee8
I checked at the local dealership (they suck btw), and it is the part number you guys posted 12622033. He said they were not available, and no dealers showed having them???
Where are you guys getting them? Price?
How many layers are the LS7's? I can't remember for sure, 3??
LS7 - 3 layer
LS3, L92, L76 - 5 Layer
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Old Dec 15, 2008 | 08:49 PM
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I need to find a set of these. Anyone know where?
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Old Dec 15, 2008 | 09:37 PM
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Originally Posted by ls2 bait
my buddy has a set in his hands right now. he measured then and they are the same thickness as the ls3 gasket but are 7 layers as opposed to 5.
Are you sure it's not 6? GM states this is a 4 layer gasket, but that doesn't include the two outer layers which would physically count as 6.
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Old Dec 15, 2008 | 10:03 PM
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Some say 7, some early press release stuff said 4. Which is it?
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Old Dec 16, 2008 | 07:48 AM
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Originally Posted by veee8
I checked at the local dealership (they suck btw), and it is the part number you guys posted 12622033. He said they were not available, and no dealers showed having them???
Where are you guys getting them? Price?
How many layers are the LS7's? I can't remember for sure, 3??
they are available. you just have to call certain people to get them. not all dealerships will go out of the way to do it. but 7 sets have been sold already. and yes they are a 7 layer gasket but again they are still the same thickness, just smaller layers.
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Old Dec 16, 2008 | 09:09 AM
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.500-.503 on the bolt holes. Have had a set here for a couple of weeks.
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Old Dec 16, 2008 | 09:49 AM
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Originally Posted by hellbents10
.500-.503 on the bolt holes. Have had a set here for a couple of weeks.
Can you measure the the bore diameter?
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Old Dec 16, 2008 | 10:31 AM
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4.090
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Old Dec 16, 2008 | 02:53 PM
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Originally Posted by hellbents10
4.090
Thank you!
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Old Dec 25, 2009 | 01:34 PM
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hey if i have a 4.010 bore, would a 4.000 or a 4.090 gasket be better for my turbo 404ci? i have WCCH edelbrock heads with a 74cc chaimber
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Old Dec 25, 2009 | 04:48 PM
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You wouldn't want the gasket smaller then the bore it will leak.
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Old Dec 25, 2009 | 05:20 PM
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i was recommended the stock 6.0 gasket, isnt that a 4.000 bore gasket??
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