4.0 Head Swap on 258 Questions - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-05-2002, 01:38 AM
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4.0 Head Swap on 258 Questions

I have a few questions about putting a 4.0 head onto a 258.What year is most preferred? Can I use one from a FS jeep? Do I have to get new pushrods? The 258 is on a 1986 cj7 with about 70,000 miles. Is there anything that I should look closely at on the motor before the swap? I don't own this jeep yet maybe I won't if the seller doesn,t take less. I am just trying to get all the info I need in advance. BTW the jeep I'm interested in is a 86 renegade with auto, hardtop,mint interior, 67,000 original miles, no rust, hardtop has never been taken off. Owner asking alot 10,000 I would pay $7500.What to you think? I'm waiting till closer to xmas to offer I think he needs cash.


John G.


"Can't get enough of that wonderful Duff!"
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post #2 of (permalink) Old 12-05-2002, 08:04 AM
tkcomer
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Re: 4.0 Head Swap on 258 Questions

Here is the write-up.

http://monsterslayer.com/jeep/40Head/40Head.htm

I got mine off of a í91 Cherokee. Iíve got about $500 in the swap, but that involved rebuilding the head, exhaust modifications, little things here and there. It made a huge difference in the performance of the Jeep. Just make sure you get the valve cover and exhaust manifold also.
post #3 of (permalink) Old 12-06-2002, 12:42 PM
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Re: 4.0 Head Swap on 258 Questions

Although 67K isnt a lot of millage for a 258, you may be best to go through the whole engine and freshen it up a bit. That way you know what you have. I had about 30K on a rebuild when I swapped. There are a lot of write ups on the net for this swap, and a lot of people have done it. If you plan on using your carb, stick with the '91-'95 head. These can also accept the Mopar EFI kit. I used a '98 head, but I had to go FI and used the newer style of exhaust/intake manifolds in conjuction with the '94 based EFI. Made for a stong running engine, but with a lot of piece meal.

Even though the interior may be great, I think $7500 is way out of line for a '86. Heck, you could get a '91-'95 YJ for less than that. Then you wouldn't have to do the head swap. I'd keep looking.
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