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Unread 09-07-2011, 03:04 PM   #1
DoozerPeej
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1990 YJ Wrangler 
 
Join Date: Nov 2010
Location: North Salt Lake, Utah
Posts: 33
4.2 to 4.0 head swap head bolts?

I have read a bunch of posts about there being different lengths of head bolt? I have a 1990 wrangler with the 4.2 and have a head (casting 7120) all ready to go. I know I have the 1/2 inch head bolts due to its the last year the wrangler had the 4.2, but I have read that a bunch of people have had issues with the 4.0 head bolts bottoming out, and then some saying they didn't have an issue. I am just curious on what everyone out there has used? or if my best bet is going to be to tear into it and once I get to that point put the project on hold and wait for the right bolts to ship. Local dealership wants $27ea for the studded ones, and $5ea for the regular ones. I can find a whole set for about $45 but they say either 4.0 or 4.2, any suggestions?

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Unread 09-07-2011, 03:38 PM   #2
Alabamaranger
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1990 YJ Wrangler 
 
Join Date: Sep 2006
Location: Leeds AL, Alabama
Posts: 1,715
I beleive I used all of my 4.2 head bolts.
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90 YJ, 4.2 with 2150 carb 4.0 Head and headers, Nutter with TFI and MSD. 1" BL, 2.5" spring lift, 33", Goodrich KM Mud Tires. Dana 30 w Aussie, Ford 8.8 w LS. 9000lb HF Winch.
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