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Starter bolt size?

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Old 10-31-2013, 08:36 AM
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Default Starter bolt size?
Does anyone happen to know what size the bolts are for the starter on an LS1?

Thanks!
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Old 10-31-2013, 08:49 AM
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Both bolts are 11mm in diameter, 1.5 thread pitch. 1 bolt measures 114mm long and the other is 54mm long, grade 10.9.

11mm X 1.5 X 114mm
11mm X 1.5 X 54mm
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Old 10-31-2013, 08:58 AM
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Awesome, thanks very much....next time Im going crate motor if for no other reason than Im sick of tracking down random bolt sizes!
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Old 10-31-2013, 09:07 AM
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Originally Posted by FLYNAVY30
Awesome, thanks very much....next time Im going crate motor if for no other reason than Im sick of tracking down random bolt sizes!


I hear ya, I just happend to have my starter with the 2 bolts sitting on my desk this morning.
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Old 10-31-2013, 10:48 AM
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much appreciated
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Old 10-31-2013, 11:43 AM
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Gm lists the starter bolts as M10 x 1.5

M10x1.5x46.5
M10x1.5x120

Some applications actually use two of the long bolts, which is starter dependent ofcourse
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Old 10-31-2013, 12:14 PM
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Originally Posted by Scoggin Dickey
Gm lists the starter bolts as M10 x 1.5

M10x1.5x46.5
M10x1.5x120

Some applications actually use two of the long bolts, which is starter dependent ofcourse

Sorry to the OP I threaded a die on my bolts this morning and thought I grabbed the 11mm x 1.5. I just rechecked after his post ^^^ and my bolts are M10 X 1.5 as well.
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Old 10-31-2013, 02:25 PM
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No worries...headed to the hardware store this afternoon
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Old 10-31-2013, 10:33 PM
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Dorman sells them in the HELP section of the auto parts stores!
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Old 04-30-2014, 08:37 PM
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Can someone confirm... Is the ls1 starter bolt the same as the 3.8l bolt?
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Old 05-26-2017, 10:32 PM
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Originally Posted by conan
Both bolts are 11mm in diameter, 1.5 thread pitch. 1 bolt measures 114mm long and the other is 54mm long, grade 10.9.

11mm X 1.5 X 114mm
11mm X 1.5 X 54mm
This needs to be deleted or edited from the thread. I just purchased a helicoil kit for m11 x 1.5 because of it.

I took a caliper to the threads, they are indeed M10, not M11
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