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Missing motor mount bolt?

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Old May 21, 2026 | 08:56 PM
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Default Missing motor mount bolt?

Hi everyone,

As I was installing my headers I realized I’m missing a bolt. It’s not a motor mount bolt but a bolt that connects the motor mount support to the frame. I have a picture attached. Does anyone know where I can find that bolt?
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Old May 22, 2026 | 03:43 PM
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looks like the original GM# is 1638817 for an LS engine mount to the k-member (98-02). Also seems to be used in several other applications. It still comes up as available from GM when I check the number in the various online stores like gmpartsgiant, etc. It's described as a HEX W/CON WA 10x1.5x25 if you wanted to try local hardware or specialty fastener stores.
Good luck!
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Old May 22, 2026 | 04:43 PM
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As you see it has that big washer....not totally necessary....3 bolts will hold it....but if it makes you feel better with 4 ....go for it
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