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Unread 06-25-2013, 12:08 PM   #1
sertshark
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1986 CJ7 
 
Join Date: Apr 2008
Location: oakdale
Posts: 58
Thread size for manifold bolts/studs?

It appears the thread size is different for the studs ( outside edges) and the bolts for the manifolds. Anyone know the sizes? I am thinking 3/8-16. But the studs on the end appear fine thread. The stud was stripped and I need to re-thread it. Thank you!!!

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Year/Model: '86 CJ7 - Engine: 258 I-6 - Lift: Pro Comp 4" - Tires: 33X12.5 - Nuttered - Team Rush'd - Howell TBI
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Unread 06-26-2013, 10:27 AM   #2
SLO_Ken
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1986 CJ7 
 
Join Date: Nov 2009
Location: California
Posts: 886
Many times, studs will have a coarse thread on one end, and a fine thread on the other. For 3/8", the thread pitches would be 16 (coarse) and 24 (fine).

(these are carb mounting studs, but you get the idea.)
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Unread 06-26-2013, 11:28 AM   #3
LumpyGrits
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1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 5,181
You might be able to retread to 5/16" dia, but that stripped stud will never hold a 3/8" dia nut again.
The thread that goes into the head is 3/8"X16thd N/C.
LG
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Unread 06-26-2013, 12:13 PM   #4
SLO_Ken
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1986 CJ7 
 
Join Date: Nov 2009
Location: California
Posts: 886
Or you can get replacement studs. They're not too hard to find. I think I got mine at Ace Hardware.
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Unread 06-26-2013, 01:51 PM   #5
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 626
On my 78 304 I have 10 3/8-16 and 2 sae 7/16 on the #1 hole. Out of those 2 7/16, 1 of them was a stud 7/16 to the engine and 3/8 through the header. That was fun to find.
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