INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

LS9 Head Gaskets

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Old 01-03-2017, 01:27 PM
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Default LS9 Head Gaskets

Ok, there seems to be a lot of conflicting info about the thickness. Depending on where you look it seems some say they are .051 and others say .055

Does anyone have a compressed used set laying around they can measure?

Ive been factoring everything based on .051 but just trying to figure exact CR numbers, its small but still wanna know.
Old 01-03-2017, 01:42 PM
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I do have a set I torqued heads down on once or twice but never ran yet. Not sure how accurate of a measurement I can get with them lol.
Old 01-03-2017, 01:47 PM
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Originally Posted by 1994Vmax
I do have a set I torqued heads down on once or twice but never ran yet. Not sure how accurate of a measurement I can get with them lol.
Do you have a micrometer or caliper, I don't figure it will be exact but trying to measure new ones doesn't get you very far.
Old 01-03-2017, 03:08 PM
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No Mic's... just calipers. I hate micrometers lol..... but I do a set and stop borrowing them.

But...... I lied. I sent the previously torqued set in a 6 liter I just finished for a guy and have a new set only sitting here. So I am no help haha.
Old 01-03-2017, 10:43 PM
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I have a gauge for that
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Mine were 0.051"
Old 01-04-2017, 06:52 AM
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You actually measured them? I just don't get how something made by GM has such conflicting info from various vendors. I've seen .051,.053 and .055

If .051 then I am 9.89
If .055 then I am 9.8
Old 01-04-2017, 08:42 AM
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Yes I measured again this morning on a used gasket. It takes quite a bit of force to squeeze it enough to measure 0.051 but thats what it would be when installed. Lightly measuring I got like 0.060 or so.
Old 01-04-2017, 10:41 AM
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Cool. Thanks Richard. Ya being new mine are way up there, and I don't wanna compress them so.



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