Tunnel Brace bolts? - Chevy SS Forum
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post #1 of 14 (permalink) Old 06-20-2019, 09:47 AM Thread Starter
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Tunnel Brace bolts?

Does anyone know the size and thread pitch of the four bolts that hold the tunnel brace?

My brace and the bolts are missing from my car after I had a shop do work on it. Pretty annoying. I didnt even know it wasnt there until two months later when I got under the car to replace my cats.

Thanks for any help.
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post #2 of 14 (permalink) Old 06-20-2019, 02:13 PM
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23190019 Brace

92138973 Bolts
dz28 and z51vett like this.

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post #3 of 14 (permalink) Old 06-20-2019, 05:28 PM
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Granatelli & BMR both make upgraded replacement braces


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post #4 of 14 (permalink) Old 06-20-2019, 07:48 PM Thread Starter
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Quote:
Originally Posted by billygoat View Post
23190019 Brace

92138973 Bolts
Did some searching and they dont seem to be the correct bolts. Every picture shows them being much longer and it also refers to them as cross member bolts. So im a bit confused.

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Originally Posted by Snaker View Post
Granatelli & BMR both make upgraded replacement braces
Well aware. Thanks though. Im going to fab up one myself first and see how I like it. Also, I dont think theirs come with new bolts.
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post #5 of 14 (permalink) Old 06-20-2019, 08:00 PM Thread Starter
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I think I found them!

GM part #: 11588738
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Last edited by MichaelSS15; 06-20-2019 at 09:44 PM.
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post #6 of 14 (permalink) Old 06-21-2019, 04:29 PM Thread Starter
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Ok guys I was able to figure it out. The first post seemed to put me on the right track at least and I was able to find the correct size bolt. It is, in fact, the bolts that I posted.

Tunnel Brace bolts are M10x1.5 and 25mm long worked perfectly. Those OE bolts are 30mm, but 25 was PLENTY.

Here is my new tunnel brace I made myself out of 1/8" aluminum. Used Stainless hardware with blue locktite. I needed to make one with a little extra clearance for the 3" exhaust anyway. I just wish the shop had told me that it was removed.

20190621_161742_1561148873836.jpg
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Last edited by MichaelSS15; 06-21-2019 at 08:01 PM.
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post #7 of 14 (permalink) Old 06-21-2019, 07:52 PM
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Is that a Magnaflow system on your ride? B.

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post #8 of 14 (permalink) Old 06-21-2019, 07:57 PM Thread Starter
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Is that a Magnaflow system on your ride? B.
Solo cat-back
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post #9 of 14 (permalink) Old 06-22-2019, 12:13 AM
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Really? Hum..... It looked like a Magnaflow resonator so I had to ask. Which level of mufflers? B.

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post #10 of 14 (permalink) Old 06-22-2019, 08:17 AM Thread Starter
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Really? Hum..... It looked like a Magnaflow resonator so I had to ask. Which level of mufflers? B.
3 inch system with their "Mach-X3" mid muffler. Kooks Headers and Kooks 3" Green cats.
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