header bolt size? - MustangForums.com


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Old 08-09-2009, 05:53 PM   #1  
89cobra5.0
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Default header bolt size?

Hey guys im running bbk unequal shorties, and I have been noticing a bad exhaust leak, I had tightened the bolts (not to the h pipe flange) a while back but forgot to do it again after they had seen heat, and the bolt 2nd closest to the firewall on the passenger side is totally gone. What size bolt am I looking to replace here?
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Old 08-09-2009, 07:13 PM   #2  
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3/8" is what you're lookin for

Last edited by Liquid_02; 08-09-2009 at 07:17 PM.
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Old 08-09-2009, 07:24 PM   #3  
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.375-16 x .75"
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Old 08-09-2009, 07:24 PM   #4  
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3/8" is what you're lookin for
3/8 cool, is there like a specific thread count or length for em?
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Old 08-09-2009, 07:35 PM   #5  
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Originally Posted by 89cobra5.0 View Post
3/8 cool, is there like a specific thread count or length for em?
Depends on how thick your flange is. Pull out an easy bolt and measure the length, you'd probably be safe with 3/4 - 1" though. It's just coarse thread as well. I usually go longer if I'm not positive how long they need to be, as you can always cut a longer bolt, which I had to do with all my header bolts (header bolts to a flange, bolts hooker gave me were about 1/8" too long, go figure), if you get a bolt that's too short, you're goin back to the hardware store.
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Old 08-09-2009, 07:37 PM   #6  
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Thanks for all the help everyone, I just need to wait a bit for another car to get home so I dont have to work on hot headers.. Id like to keep the skin on the back of my fingers this time =D
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