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Old 08-11-2011, 08:24 PM   #1
Join Date: May 2010
Posts: 3
4.2 carb intake stud size


This is on my 1990 Wrangler with 4.2L. I am swapping to the Motorcraft 2100 carb...and I bought a whole swap kit from ebay seller.

There is a spacer/adaptor with allen head bolts that bolt into the existing carb stud bolt holes on the intake manifold...but they don't want to go in easily.

I am going to use a tap to clean up the threads...but when I search, I can't find the size of the threads. It looks to be a coarse 5/16 (18) thread. I took one of the new bolts to the hardware store and matched it to a nut of that thread pitch.

Can someone please confirm the size for me?


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Old 08-13-2011, 10:55 AM   #2
Join Date: May 2010
Posts: 3
No one has any answer to this?

Can someone point me in the right direction where to find the info? The search didn't work...

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Old 08-19-2011, 08:39 PM   #3
Join Date: Feb 2011
Posts: 31
Taking the bolt to the hardware store is exactly what I would have done. And they are indeed 5/16 (18) thread. I just did a Weber swap about 3 weeks ago and they are supplied with the kit.
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Old 08-20-2011, 08:17 AM   #4
Join Date: May 2010
Posts: 3
I appreciate the response....the threads in the intake were messed up enough that I wasn't sure. I got confirmation from another source...then used the 5/16 (18) tap to clean up the threads for the swap.
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Old 08-21-2011, 08:40 AM   #5
Join Date: Feb 2011
Posts: 31
good luck on that and future projects.
Missouri Bound is offline   Quote Quick Reply

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