Cylinder head - JeepForum.com
 
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post #1 of 3 Old 03-03-2002, 06:58 PM Thread Starter
Josh
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Join Date: Feb 2002
Location: Michigan
Posts: 36
Cylinder head

I was wondering if anyone here has put the 4.0 cylinder head onto a 4.2 motor and if so, how much power did you pick up, and what is the cost the head whether it was new or used, thanks guys


1987 Wrangler, mods...currently torn apart, working on new motor, SOA, Dana 300, d44 front, ford 9 rear
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post #2 of 3 Old 03-04-2002, 02:58 PM
sixpak
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1972 CJ5 
 
Join Date: Jan 2002
Location: carlisle ohio
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Hello, In my opinion it is the single best mod you can do for the 4.2. You will hear that it is not possible without filling the water jacket holes in the head. I would suggest putting it on using the STOCK 4.0 head gasket and giving it a whirl. Chances are that it will be fine as this is what I did with my sand drag motor and it worked fine for two seasons until I built my own stroker motor using the 4.0 block. It is possible that after insalling the head that it may leak between the head and block and if so it will be noticable during filling the motor will antifreeze or the first test drive usually. I also suggest getting an aftermarket cam based on your intended use for the motor. Don't forget to pick up the intake and exhaust manifolds too. Make your own adapter for the injected intake, plug the injector holes and happy motoring! I did this mod back in 89 or so and the race car picked up 3 tenths on a 300 foot sand drag track with no other changes.
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post #3 of 3 Old 03-04-2002, 05:46 PM Thread Starter
Josh
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Location: Michigan
Posts: 36
Thanks for the reply, I what about putting it on a block out of a CJ Jeep, as I hear the motors are slightly different, this will be a daily driver, anything I can do about the water jackets? thanks again

1987 Wrangler, mods...currently torn apart, working on new motor, SOA, Dana 300, d44 front, ford 9 rear
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