Biggest motor in a jeep!?!?! - JeepForum.com

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post #1 of 87 Old 10-15-2011, 06:30 PM Thread Starter
ctappan94
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Biggest motor in a jeep!?!?!

what's the absolute largest displacement motor able to be squeezed into a jeep without coming out of the hood...pushing out of the grill..or requiring extensive fabrication of the fenders or body tub.

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post #2 of 87 Old 10-15-2011, 06:40 PM Thread Starter
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i meant in a cj7!!
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post #3 of 87 Old 10-15-2011, 06:46 PM
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Well, I've seen big block Chevy's swapped into CJ's before, and they can be punched out to monstrous displacement, like 572 and larger, but the blocks are all the same size (give or take, I do realize there are tall deck engines that are slightly bigger than other big blocks). The 500 ci Cadillac is also a possibility, as they're not that large physically. Is this just a trivia question or are you planning a swap?


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post #4 of 87 Old 10-15-2011, 06:46 PM
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Well the extensive fabrication might be the question mark, but define extensive in your mind. A member KW89... has a Chevy 496 (stroked 454 I assume) in one. He may not consider the mods extensive but others might. Essentially you can put just about anything in there, I am not up to date on the largest cube mountain motor available today, but I would guess it's in the 700+ cube range. There are also many small block stroke kits that put engines into the mid 400 cube area, so again, do you consider adapting one to a small block extensive? Some would.


As far as basically factory a 401 will go right in place of a 304.
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post #5 of 87 Old 10-15-2011, 06:51 PM Thread Starter
ctappan94
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Well I'm either putting in a 454 leaving it at that or boring and swapping the crank to make it a 496 or 502. Debating on whether or not to put a blower on a 496. hahah! but seriously.. I might swap to a 572.. not really sure what I want! I just want to be able to find or make mounts.
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post #6 of 87 Old 10-15-2011, 06:53 PM
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My question would be why?? I think even KW will tell his is overkill and waste of power.

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post #7 of 87 Old 10-15-2011, 06:56 PM
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I agree. But what would Tim "The Tool Man" Taylor say?

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post #8 of 87 Old 10-15-2011, 06:58 PM
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Big block Chevy's are often installed in the CJ-5 and CJ-7. Headers can be tricky around the steering shaft. The obvious installations of the AMC 360/401 and the Chevy 350 are by far the most popular if you're going the V8 route.
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post #9 of 87 Old 10-15-2011, 07:14 PM
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Go to Novak they put LS6 drive trains together for CJ7s

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post #10 of 87 Old 10-15-2011, 07:17 PM
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I'd start picking a drivetrain out that can handle it and brace the frame or you won't make it around the block.

We have a guy here in town with a absolutely amazing 440 Mopar in a cj8 with a 4 spd and 9 inch axles front and rear. Its a pavement pounder for sure but it made me speechless.

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post #11 of 87 Old 10-15-2011, 08:13 PM Thread Starter
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well its gonna be on a new tdk chassis. So.. if i have to brace it, I will.. but still.. my favorite motor is a 454 but if you're saying I'm going to have header issues, then forget it. I want it to be a blown motor and I will take the criticism for it and how stupid it might look on a jeep . lol If a 454 is too big, should I go 396, 383? Or should I go ford? or amc.. the only issue I have with AMC is that the parts are hard to find and expensive. I also know that amc's were notirously innefficient and I believe the 360 and 401 had substantial oiling issues as well as lower power outputs than those in its class. but under no circumstances will I do a 350.. I am going for uniqueness, guys!
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post #12 of 87 Old 10-15-2011, 08:16 PM
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post #13 of 87 Old 10-15-2011, 08:17 PM
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Quote:
Originally Posted by ctappan94 View Post
well its gonna be on a new tdk chassis. So.. if i have to brace it, I will.. but still.. my favorite motor is a 454 but if you're saying I'm going to have header issues, then forget it. I want it to be a blown motor and I will take the criticism for it and how stupid it might look on a jeep . lol If a 454 is too big, should I go 396, 383? Or should I go ford? or amc.. the only issue I have with AMC is that the parts are hard to find and expensive. I also know that amc's were notirously innefficient and I believe the 360 and 401 had substantial oiling issues as well as lower power outputs than those in its class. but under no circumstances will I do a 350.. I am going for uniqueness, guys!
Chevy is the way to go for sure.

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post #14 of 87 Old 10-15-2011, 08:19 PM
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Or a 460, those are pretty easy to find in junk yards.

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post #15 of 87 Old 10-15-2011, 08:34 PM
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396 is basically the same size as a 454, 383 in a low deck Chrylser so why not build a 440 wouldn't be lot of difference in fit, unless you are talking about a 383 stroker SBC which starts as a 350 so what's the difference. Unique in a Jeep??? Turbo cummings, leaning tower of power (225 slant 6), I looked at one with Ford 300 that was different.

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