MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

thinking about a 318 swap...

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Old 02-13-2014, 09:03 PM
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Originally Posted by Jeepjunky
well this motor is goin to be laying around my shop at one point or another so i might as well use it. now will a np231 fit on the 727tf because im planning on a 231/300 doubler and the 300 might get 4:1 gears. and i got a HPd44/9in for axles and plan on 37s

I would steer clear from this if I was you, even behind the 4.0 they blow. I have seen way to many of my friends blow them, in person, not just hear say. Either save extra money and get a Atlas, 241OR, or do a 231/205.
Old 02-13-2014, 09:11 PM
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Originally Posted by Jeepjunky
well this motor is goin to be laying around my shop at one point or another so i might as well use it. now will a np231 fit on the 727tf because im planning on a 231/300 doubler and the 300 might get 4:1 gears. and i got a HPd44/9in for axles and plan on 37s
You can do a 318 blows up video for YouTube. There is probably several of them already though.
Old 02-13-2014, 09:20 PM
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Check this one out. Just keeps going and going......
Old 02-13-2014, 09:20 PM
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Originally Posted by mdo817
I would steer clear from this if I was you, even behind the 4.0 they blow. I have seen way to many of my friends blow them, in person, not just hear say. Either save extra money and get a Atlas, 241OR, or do a 231/205.
motor trans or tcase? not sure what you mean
Old 02-13-2014, 09:23 PM
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Follow up video.....
Old 02-13-2014, 09:29 PM
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i know that the 4.0 cant die, i got 2 in my shop waiting on future project jeeps and 1 of them is goin to be a 4.6 stroker. they are great motors, just wondering if the 318 is worth building to 300-400hp and throwing it in there
Old 02-13-2014, 09:46 PM
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Originally Posted by Jeepjunky
i know that the 4.0 cant die, i got 2 in my shop waiting on future project jeeps and 1 of them is goin to be a 4.6 stroker. they are great motors, just wondering if the 318 is worth building to 300-400hp and throwing it in there
I wouldn't put any money in a 318. If you want cheap horsepower get a 350. Port and polish the heads and intake. Aluminum if you can afford it. Jet you Q jet .072 with the 44b metering rod and the some "DA" (.044") rods on the secondary side. Easy 300 plus horsepower if bottom end is up to par.
Old 02-13-2014, 09:49 PM
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Not sure if the cooling system could handle that much heat though.
Old 02-13-2014, 10:00 PM
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I was speaking of the 231/300 doubler, they go BOOM way to often.
Old 02-13-2014, 10:11 PM
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Originally Posted by mdo817
I was speaking of the 231/300 doubler, they go BOOM way to often.
is it the outputs that break on your guys 300 or something else?
Old 02-13-2014, 10:16 PM
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Mostly, even the up-graded one, also a few split cases
Old 02-13-2014, 10:37 PM
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hmm, an atlas would be nice, but cant make myself spend $3500 on one though. did the 300s blow like when they were really beating on them or just like light duty stuff
Old 02-13-2014, 10:57 PM
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well callin my engine builder tomorrow and gettin his take on the 318. dont really want to go with a 350 cuz ill probly still end up spending the same when you factor in gettin the motor. if i could i would use my dad's 426 he had built for his race car a while back (round 600-650hp) but cant use it.
Old 02-13-2014, 11:00 PM
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350s are a dime a dozen. Just stick with your 4.0.
Old 02-13-2014, 11:04 PM
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the only way i get a 350 would be with a 4 bolt main and i would still probly stroke it out to 383 so its better to not tempt myself


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