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Exhaust Manifold Bolt Size

Old Mar 10, 2013 | 10:04 AM
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Default Exhaust Manifold Bolt Size

Hello, I am in the middle of swapping out my heads and in the process my manifold to head bolts broke, all of them. I guess its a good thing I bought brand new heads. Anyway, I can not find the specs on the bolts I need in order to put my exhaust manifolds back on. So can anyone please tell me the size of the bolts I need? I know I need 6 of them.

BTW I have a 2000 Ram 3500 5.9 V8 360
 
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Old Mar 10, 2013 | 10:12 AM
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5/16 x 18 by 1 inch long

Six per side.
 
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Old Mar 10, 2013 | 10:15 AM
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1"? My exhaust manifolds are about 1" thick. Can you double check that please?
 
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Old Mar 10, 2013 | 10:22 AM
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Have a look at your manifolds...... looking at the parts manual, it appears there are two different sizes? (center two bolts shorter than four on the ends....)
 
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Old Mar 10, 2013 | 10:24 AM
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Yes that is true
 
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Old Mar 10, 2013 | 10:25 AM
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stock bolts, for stock manifolds are about 2.5-3" long. if youre staying with the stockers just take your manifold to the hardware store and get a bolt that has threads sticking out the other end 3/4-1"
 
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Old Mar 10, 2013 | 10:28 AM
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Ok, short ones: STUD, .312-18/.312-24x2.25 P/N 06034643 (need a total of four)

Long ones: SCREW AND WASHER, Hex Head, .312-18x3.125 P/N 06034806 (need total of eight)
 
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Old Mar 10, 2013 | 10:37 AM
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so at a hardware store I would need to get 5/16"-18 thread correct and 2 1/4" long and 3" long?

Sorry for being a pain
 
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Old Mar 10, 2013 | 10:41 AM
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I think so.... But, the longer ones are 3 and an eighth.
 
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Old Mar 10, 2013 | 10:50 AM
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Originally Posted by Arborist87
so at a hardware store I would need to get 5/16"-18 thread correct and 2 1/4" long and 3" long?

Sorry for being a pain
no, the 2 1/4" bolts, are actually studs, and are only needed to be about 1.5" ill go out and confirm. ill come back and report soon.
 
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