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post #1 of (permalink) Old 09-21-2001, 04:11 PM Thread Starter
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Need a link for 4.0 head swap

I am thinking of doing the 4.0 head swap on my 258. Does anybody know of a link to a write up on the process? I did a search but found way to many posts to go over them all. Also is it worth the time and money to do the swap if you are still going to run a carb instead of MPI (the MC2100 came today!)?

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post #2 of (permalink) Old 09-21-2001, 05:14 PM
 
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Re: Need a link for 4.0 head swap

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

-Tas
'89 YJ Wrangler, 4.2L, AX-15, 31x10.5" BFG AT KOs, no lift, 40series Flowmaster, Euro-taillights...

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post #3 of (permalink) Old 09-21-2001, 07:17 PM
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Re: Need a link for 4.0 head swap

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

clicky

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post #4 of (permalink) Old 09-23-2001, 11:01 PM
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Re: Need a link for 4.0 head swap

Check the post previously given. It has most of the bases covered. I did the conversion about 1000+ miles ago. I needed head work anyway so I went that route. I have it carbed with the POS carter and it was still worth it. It runs smoother through the RPMs. I don't have the need to down shift on hills anymore. The engine runs cooler(probably due to the clean head) and I would expect if I would give it more fuel/air (bigger carb) it would take it no problem. I did not use any spacers or re-tap the block I just had a friend help me carefully line up the head on the block, so you know it can be done. Matching up the exhaust is about the trickiest part. While you have it apart you might want to hone your cylinder walls. 220 sandpaper will work fine just take your time and go around in a corkscrew motion(more horizontal than vertical) in both directions. It is not throw you back in your seat power but a definite improvement!

Matt
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post #5 of (permalink) Old 09-23-2001, 11:02 PM
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Re: Need a link for 4.0 head swap

Check the post previously given. It has most of the bases covered. I did the conversion about 1000+ miles ago. I needed head work anyway so I went that route. I have it carbed with the POS carter and it was still worth it. It runs smoother through the RPMs. I don't have the need to down shift on hills anymore. The engine runs cooler(probably due to the clean head) and I would expect if I would give it more fuel/air (bigger carb) it would take it no problem. I did not use any spacers or re-tap the block I just had a friend help me carefully line up the head on the block, so you know it can be done. Matching up the exhaust is about the trickiest part. While you have it apart you might want to hone your cylinder walls. 220 sandpaper will work fine just take your time and go around in a corkscrew motion(more horizontal than vertical) in both directions. It is not throw you back in your seat power but a definite improvement!

Matt
CJ-8
Email me if you have any ?s [email protected]

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