That's an awesome conversion. Never thought a 4.0 head would mount up to a 4.2 block. I stumbled across this site while searching for into about blown head gaskets. I'm installing a new head gasket on my '92 Wrangler (4.0L) this weekend and stopped to look at some of your pics. It has took me about 4-5 hours to get everything unbolted and off and I'm waiting until tomorrow to get some help with lifting the heads off. Especially now that I've read it's about 77lbs!!! Good luck on your future mods and happy Jeepin'
Nick / Champaign, IL, UNITED STATES
Posted Dec 05 2007 01:38PM
I was wondering if doing the 4.0L head swap would cause any problems with later trying to add a Howell TBI fuel injection kit. Would the switch from a 4.2L head to a 4.0L head cause any problems with this? Thanks.
84jeep / memphis, TN, UNITED STATES
Posted Dec 20 2007 09:32PM
will the 5speed transmission and transfer cases out of a wrangler fit in a cj 7 258?
Robbie / Vacaville, CA, UNITED STATES
Posted Dec 30 2007 04:37AM
Can you use fuel injection from the same jeep you got 4.0 head and the computer and injecters.Will it work what about the check engine light. I have a 87YJ with 258 engine.Are their any sites to get more info.
oregon yj / Monmouth, OR, UNITED STATES
Posted Jan 07 2008 10:36PM
Ok am i missing something my 4.2 intake does not appear to fit my 4.0 head. everything i have read says all you need is a new header nothing about a intake PLEASE HELP!
Chris Yoos / Wichita, KS, UNITED STATES
Posted Jan 11 2008 09:22PM
Was there a change in the head design after 1992 or '93. I checked on aluminum valve covers from Crown and was told that the valve covers they make would not fit the earlier 4.0L engines, that they used a different head.
MonaCJ5 / Enfield, CT, UNITED STATES
Posted Feb 01 2008 10:49AM
Okay , I did the head swap. Like other readers , the intake wont reach the head. It hits the exhaust. I have a 74 CJ5 258/ I have a 92 head. Whats the skinnie. Do you need the 4.0 intake,a different exhaust or what. I wanna try this out ! Help Thanks Frank
Ricardo Rebaza / Lima, PERU
Posted Feb 06 2008 11:41AM
I am planning to do the swap, is there anything else should be done to run the engine, looks pretty easy.
blubear / mesa, AZ, UNITED STATES
Posted Mar 05 2008 05:28PM
have a 1997 wrangler with a cracked headler also have a 89 4.0 steel headler will it fid on my 1997 4.0 i notice the headler you put on the new head it the same as my 89 just donot for sure and is it a good swap
Posted Nov 30 2007 10:29PM
