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Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

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5.7 or 6.4

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Old Mar 15, 2012 | 07:30 PM
  #1  
HLKSTER's Avatar
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From: Smell A
Default 5.7 or 6.4

Which would you choose 5.7 or 6.4 ?
TIA
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Old Mar 15, 2012 | 07:40 PM
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"Theres no replacement for displacement"
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Old Mar 15, 2012 | 08:00 PM
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Whatever is cheaper and lower mileage! Unless your buying a crate motor/new! Then it comes down to $$...
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Old Mar 15, 2012 | 08:17 PM
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Originally Posted by BStelling
"Theres no replacement for displacement"
lol i cant count how many times ive heard my fiances dad say that lol
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Old Mar 15, 2012 | 08:40 PM
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Originally Posted by BStelling
"Theres no replacement for displacement"
Turbos are the answer!
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Old Mar 15, 2012 | 08:55 PM
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I think it depends on your install objectives and how many upgrades you have or are springing for.

For example, if you have a sport and base axles the larger motor will tear everything apart (like the smaller motor likely will).

An 07-10 5.7 is about 330 HP. an 11 or 12 is getting into the 370hp range.
A 6.1 is in the 380-425 range. A 6.4 is likely in the 400-475 range, depending on year.

I am trying to use my Rubi case and 6-speed. It looks like I can use a 5.7. A 6.1 or 6.4 would probably give me problems and I run dual 60's currently.

I found a 6.1 (not tranny) that came backed to a 6-speed for under 3K with 10K miles on it. I've found older 5.7's (08) in the 2500 range.

My friend just bought a 2012 5.7 with 15 miles on it for 4700 but it had the tranny/t-case and all wiring + ECU included.
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