Thread size for manifold bolts/studs? -

LinkBack Thread Tools
post #1 of 5 Old 06-25-2013, 12:08 PM Thread Starter
Registered User
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!!!

Year/Model: '86 CJ7 - Engine: 258 I-6 - Lift: Pro Comp 4" - Tires: 33X12.5 - Nuttered - Team Rush'd - Howell TBI
sertshark is offline  
Sponsored Links
post #2 of 5 Old 06-26-2013, 10:27 AM
Registered User
1986 CJ7 
Join Date: Nov 2009
Location: California
Posts: 1,057
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.)
SLO_Ken is offline  
post #3 of 5 Old 06-26-2013, 11:28 AM
Registered User
1985 CJ7 
Join Date: Jul 2010
Location: The Mojave Desert - Palmdale, Ca. U.S.A.
Posts: 6,512
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.
LumpyGrits is online now  
post #4 of 5 Old 06-26-2013, 12:13 PM
Registered User
1986 CJ7 
Join Date: Nov 2009
Location: California
Posts: 1,057
Or you can get replacement studs. They're not too hard to find. I think I got mine at Ace Hardware.
SLO_Ken is offline  
post #5 of 5 Old 06-26-2013, 01:51 PM
Registered User
1978 CJ5 
Join Date: Mar 2013
Location: Jefferson
Posts: 624
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.
LeePrather is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome