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Old December 7th, 2011, 11:52 AM   #1
MudCountry097669
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1992 yj Mopar Swap???

Im thinking im in for a huge headache..Ive desided to go big,maybe too big, with my First jeep build.I came across a true 1971 440 six pack, Id like some feed back from you guys who've done builds in the past with big blocks and jeeps, I mean any and all info WILL BE HELPFUL!
Thanks fer the help!
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Old December 7th, 2011, 02:49 PM   #2
nosights
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Don't do it...thats the short answer.

Long answer- They are heavy and run hot! They are big and harder to fit in small areas (around suspension, exhaust, brake booster...). I have been down this road and can say the only upside I have enjoyed is the sound! Yes the power is good, but a decently built small block will keep up and not have the downsides.

That being said, I did enjoy running my last build (440 powered Ramcharger) up the dunes...the nearly 500 hp was fun and turned heads...but it sucked in rock crawling...heavy and I could feel it!

I just don't see the upsides outweighing the downsides. I highly doubt I will ever do another big block build for off roading...now my 68 Plymouth, hmmm the 440 will stay in there.
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Old December 7th, 2011, 02:50 PM   #3
nosights
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Oh, and if it is a numbers matching 6 pack...you have some coin sitting there.

If you do run the 440 in the Jeep, ditch the six pack...cool factor in a car is there. In a Jeep, just a pain to tune!
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Old December 7th, 2011, 02:53 PM   #4
nesterautogroup
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A buddy of mine recently did a GM 454 an early 90's wrangler. It went surprisingly well for him, but he is very talented. I was dead against it until it was done and went for a ride, amazing power and it really isn't that much heavier than a small block, about 150 pounds, so I am told.
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Old December 7th, 2011, 03:09 PM   #5
FORD FLARESIDE
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I own a BB YJ with a 396 Bowtie. I get a lot of comments made to me about it being to heavy and not needed..........
If you can build it, and do it in under a year, and its something you want to do. Do it!.

I have issues with my drivetrain, but its kind of fun to work through them.
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