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1999 F Body LS1 motor mount bolt sizes.. 10mm and 15mm?

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Old 01-08-2016, 06:52 PM
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Default 1999 F Body LS1 motor mount bolt sizes.. 10mm and 15mm?

Bolts into the block, and bolts into the frame... what socket/wrench size are the heads? Is the motor side 10mm and the frame side 15mm?

I want to make sure I have all of the tools I need before I start.
Old 01-11-2016, 04:18 PM
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I've seen 13 and 15 in the block and the heat shields are 10s. The frame are 15 if I remember right.
Old 01-11-2016, 07:17 PM
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I just put new mounts in my car and the bolts for the block were 13mm and the bolts for the frame were 15mm. This on a 2000 TA. The heat shield on the driver's side had 10mm nuts that were screwed to the bolts (bolts have a small stud in the head) that mount to the block. So you will need 13mm deep well sockets.



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