4.0 Jeep head swap in a 4.2 L motor, test & tune 1/8 mile racing
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After the 4.0 head swap in a 4.2 L motor, we got good results in the 1/8 mile test and tune. The CJ7 went .6 better in the eight mile ! This is a 1985 CJ7, 5 spd., motorcraft 2100 carburator, 4.56 gears, 35' tires, 6" lift, weight is 3740 lbs with driver and the best speed in the 8th was 60.54 mph. at Homestead Miami Speedway.
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Great... very Nice driving skills
Whooped that dodge! Very impressive
Back in 87 a buddy's parents got a new Cherokee with the 4 liter. When he got his license finally he drove it occasionally. We were kinda shocked it whooped up pretty bad on a late 70s smogger Vette at a couple runs at a stoplight dragrace, it had some nut.
Awesome. I've been in debate of what to do.i got a great 4.2 and I was wanting to do the head swap. Anyway you would write up a build list of what you used and had to do?
Some of the fastest cars are still carb mate.
nice run. Clifford performance claims that throwing chevy valves in a 4.2l head will even out flow the 4.0. How is mpg on a normal drive? thanks
Looking to do the same thing, right now I have a carbed 4.0, just rebuilt,but I do have a complete 4.2 on the stand.What cam did you put in
@STRAPPARTS
7 жыл бұрын
MrPryceTagg1 The block is the 4.2 with the original 4.2 cam, crank and pistons, remember this is a push rod engine and the cam is in the block and Not the head. Hope this helps!
stroker?
I have have a cammed up 1999 Cherokee. Maybe we can race?
what trans are you running
@STRAPPARTS
9 жыл бұрын
bailey feldman T5
I am looking at a 4.2 motor locally for $200 to take the crank out and swap in my 4.0 Grand cherokee. Do you think I will run into any problems at all with the crank fitting? I am thinking I shouldnt have any issues. But me thinking is No Bueno sometimes. I haven't found too much on swapping the 258 crank.
@STRAPPARTS
9 жыл бұрын
yes thats how you built a stroker motor
@bradleycampbell5933
7 жыл бұрын
there are two ways for a stroker. from what i have read is the 258 crank. and you can go with 4.0 rods is the better way. or the 258 rods.. the pistons needs to be replaced because the height of the piston vs the location of the wrist pin vs the block deck needs to be sorted out.
You smoked him! Did the same swap to my Eagle, the 4.0L head really woke it up. I also installed a Comp Cam and some homebrew TBI. A little Moab action. kzread.info/dash/bejne/oqiHuNeElcKYh5M.html
what type of header did you go with after the 4.0 head swap?
@STRAPPARTS
7 жыл бұрын
nate b : I used the one sold by Auto zone for the Jeep Cherokee 1990 4.0.
@STRAPPARTS
7 жыл бұрын
Note that there are a few places were trimming/grinding is required to fit the carbed intake on the 4.0 Head.
@91ranger1
7 жыл бұрын
STRAPPARTS : I figured a little modification had to be done for exhaust. I'm in the middle of a swap now. what head did you end up going with? also any other add ons? I got the 7120 and thinking of a upgraded cam for it
@STRAPPARTS
7 жыл бұрын
from a 97 or 98 Cherokee at the junkyard.
@91ranger1
7 жыл бұрын
thanks for the reply's. I hope mine turns out as well as yours once I'm done.
wait, you swapped the 4.2 head on and kept the carburetor?
@STRAPPARTS
9 жыл бұрын
Matt, we wanted to keep the carb! because is a CJ7 and for simplicity sake. The 4.0 head breathes better than the 4.2 because it has larger valves and ports!!!!
@matt-jv8gh
9 жыл бұрын
what kind of modification to the manifold did you have to do? and is there any significant gain or loss of carb over fuel injection?
Wait, I just picked up an 89 wrangler with a 4.2 that needs help. Wtf do I need to do? Bro I need details, good lookin out..
@URDAD939
5 жыл бұрын
kzread.info/head/PLpcfFxafn4EL-VfrKQmaRtPM67vUthHXV
Robertayyy what parts you looking for. Can probably look at shipping you some PM me