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  #1  
Old 02-06-2013, 02:33 PM
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Default 5.7 Hemi Differences

Kinda off subject for this forum but a lot of you guys may know more about this than I.

My father in law is doing a build on a 69 Coronet Super Bee, and we both have been looking into finding a 5.7 Hemi to use as a power plant. This is where some info is needed, the 5.7 is used in both cars and trucks and if I'm not mistaken the truck version uses a different crankshaft and possibly cam???

What else is different between the two engines??? And if known what is the most power avaible for doing a build. He's wanting 700whp, would it be cheaper in the long run to get a 6.1 hemi and bore it to a 426 specs and supercharge??

Thanks for all the advice in advance.
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Old 02-06-2013, 05:48 PM
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The rotating assembly is the same between all of the non-vvt 5.7Ls. The cam is slightly different, geared more towards torque than the LX one. The intake manifold is also different with the truck having longer intake runners and a different location for the throttle body.

If you want to be looking at 700rwhp then you should really start with the 6.1L with a forged 400 or 426 stroker with either a F1-C or a 3.6 kenne bell, depending on where you want your power band to be.

Getting 700rwhp out of a 5.7L will be harder to do, but the block is thicker, so you can look at a 370 stroker and go for more boost. There are lots of ways to look at making power, you just have to plan it all out before hand.
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Old 02-07-2013, 05:14 PM
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Thanks that helps I'll be bringing the idea of a 6.1 to his attention sounds more ideal to his wants as far as WHP.
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Old 02-07-2013, 05:30 PM
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You don't want a newer engine that uses a computer to control it & i do not believe the 1969 had any computers

i would be looking at a 340 or 360 engine to build up
this is what can be done, google search
http://www.google.com/#hl=en&sugexp=...w=1280&bih=666

NASCAR engines punch out 700 HP, but their engines are nothing like a stock factory engine block
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Old 02-08-2013, 10:39 AM
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He's wanting a EFI engine, he's had 440's and 383's before and wanting to try something new. He also in 2011 traded in his 2009 R/T Challenger for a 2012 Ram and he liked how that car responded even tho it was stock. That's why he's had his eyes on a 5.7 hemi to use as the power plant. I've been looking online and have found that you can get a 6.1 Hemi for about $6,000 can't remember the exact numbers of coast but that's close..

I'm just tryin to gather as much information on a good way to go engine wise while the car is still having body work done. Any information is helpful, thanks.
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