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Broken Bolt Size Intake Manifold

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Old Jan 15, 2025 | 08:16 PM
  #1  
pete2833's Avatar
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From: Gibsonia Pa
Car: 1986 Camaro Iroc
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23
Broken Bolt Size Intake Manifold

I was removing the fuel rail to replace injectors and I tried working a bolt out and it snapped.
Bolt is on the front of the lower intake manifold. It is the bolt that holds the bracket to the manifold with the fuel lines going to the rail.
Front of manifold just below the thermostat housing.
Need to drill it out and retap.
Any one know the size of the original bolt ? That way I can drill the appropriate hole to retap.
The pic isn't my manifold. Just a pic for an example.

Thx !

Last edited by pete2833; Jan 15, 2025 at 08:20 PM.
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Old Jan 15, 2025 | 09:10 PM
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Re: Broken Bolt Size Intake Manifold

Should be 3/8"-16 like all the other accessory bolt holes on a SBC.

Use a Heli-Coil of the correct size. DO NOT hallucinate that drilling it out larger to some weird size is A Good Idea. It's NOT.
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Old Jan 16, 2025 | 04:52 AM
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From: Gibsonia Pa
Car: 1986 Camaro Iroc
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23
Re: Broken Bolt Size Intake Manifold

Originally Posted by sofakingdom
Should be 3/8"-16 like all the other accessory bolt holes on a SBC.

Use a Heli-Coil of the correct size. DO NOT hallucinate that drilling it out larger to some weird size is A Good Idea. It's NOT.
Thanks. I also contemplated finding the same intake and replacing it. I will probably have to remove it to tap it. Can’t get a straight shot with a drill.
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Old Jan 18, 2025 | 03:53 AM
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Re: Broken Bolt Size Intake Manifold

Yes, it is 3/8"-16.
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