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Old Jun 13, 2007 | 06:00 PM
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Default Engine mount bolts

What are the size for the engine mount bolts that are used through the motor mounts? I dont have any idea, since mine were not with my LS1.

And does anyone have a pic of proper mount oreintation.
Thanks
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Old Jun 13, 2007 | 06:35 PM
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The heads of the bolts that go through the clampshell into the engine are 13mm. The throughbolt is 18mm. I'm not sure what you mean about proper mount orientation. It's pretty easy to figure out once you have some mounts. Just remember that the little metal tabs that extend out from the mounts themselves go on top, not on the bottom.
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Old Jun 15, 2007 | 05:15 AM
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Originally Posted by The Hammer28
The heads of the bolts that go through the clampshell into the engine are 13mm. The throughbolt is 18mm. I'm not sure what you mean about proper mount orientation. It's pretty easy to figure out once you have some mounts. Just remember that the little metal tabs that extend out from the mounts themselves go on top, not on the bottom.
Thanks man.
I am working on finding some throughbolts for the calmshell.
I am just trying to figure out how many inches dont have threads and how much thread is on the end. Such as X" bolt with X" thread length.

As for the tabs, that is what I was wondering. Thanks for that info!
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Old Jun 15, 2007 | 06:50 PM
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I just picked up a 7/16" 6" bolts...hope they work
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Old Jun 15, 2007 | 09:15 PM
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My guess is that 7/16" stud size is too big. You will have a hell of a time trying to get those through.

I think they're more in the neighborhood of 3/8", maybe even 5/16".

Last edited by ShevrolayZ28; Jun 15, 2007 at 09:28 PM.
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