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Previous Thread Next Thread Print Thread Rate Thread Jeep 4.0 Head on a Jeep 4.2 Block #788284 02/10/07 08:57 PM Joined: Feb 2007 Posts: 2 R Renegad87 OP Need a Spot I was wondering if anyone knew anything about putting a 4.0 Head on a 4.2 Block. Is it possible? If so what do I need? The reason I'm asking is my old 4.2 head off my 1987 Jeep Wrangler has cracked and can not be fixed. The last 2 heads I've order have been for a 4.0. I guess no one knows that theres a diffence between a 4.0 and a 4.2 I already know that the valve cover will need to be changed but I'm not sure the head will actually line up with the mounting holes on the head. Any help will be appreciated. Thanks. Re: Jeep 4.0 Head on a Jeep 4.2 Block [Re: Renegad87] #788285 02/10/07 09:50 PM Joined: Jun 2004 Posts: 1,063 new jersey cuervo25 Body Damage is Cool there is a post in here with some sites on it about a head swap. It is titled engine and tranny swap. yes it can be done but you will need the wiring fuel injection and so on to do it. out of all the jeeps in this town the d**n gremlin had to invade mine I've done so much,with so little for so long i can practicly do anything with nothing Re: Jeep 4.0 Head on a Jeep 4.2 Block [Re: Renegad87] #788286 02/11/07 02:19 AM Joined: Mar 2004 Posts: 2,398 Mississippi JeePete Body Damage is Cool Do a little searching, here and with Google. Yes, it will fit, it's a great mod if you have the right casting number on the 4.0 head (some flow better than others). I did it on my 86 CJ and used my 4.2 intake and carb. Even without the MPI it made a huge difference for the better. Some waterjacket holes in the 4.0 head may have to be filled/plugged. There are plenty of online instructions on various methods. <img src="/forums/images/graemlins/cheers.gif" alt="" /> Freedom Off Road Moderated by  4x4Wire  Hop To Mitsubishi Forums ------  Mitsubishi 4x4 and SUV Tech  Mitsubishi Diesels  Mitsubishi ArchiveToyota Forums ------  Early Toyota Trucks  Toyota 4Runner, FJ Cruiser &...  T100 & Tundra Forum  Tacoma Forum  Toyota Tech ArchiveJeep Forums ------  Jeep Talk  Jeep TechIsuzu Forums ------  Isuzu 4x4 & SUV Talk  Isuzu 4x4 & SUV Tech  Isuzu DieselsKia Forums ------  Kia Talk  Kia Sportage & Sorento TechOff Topic Chat ------  4x4 Gallery  Off-Topic Chat  Recreational Access & Land ...  Politics4xForums ------  Outdoor Gear  General 4x4 Discussion  Tools and Fabrication  General Communications  Amateur Radio  GPS and MapsParts Bin ------  Private Party - Garage Sale  Private Party - Items wanted  Vendors, Hot Deals, Group Buys4x4Wire Back Yard ------  Suzuki Forum  AZ Crawler Crew  Cal-Nev Crew  General Ford 4x4 & SUV Forum  General Dodge 4x4 & SUV Forum  General Chevy 4x4 & SUV ForumFeedback & Testing ------  Problems, Questions, Suggestions4x4Wire Staff ------  Forum Moderators  Problem Threads Print Thread Switch to Threaded Mode 5 Excellent 4 Good 3 Average 2 Bad 1 Terrible View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts

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