5.9 cr or 6.7 for conversion?

skav · Oct 12, 2011

I'm thinking of a conversion for my 99 and would like to know which motor is the best option.

I already have a twin setup for the 5.9 but if the 6.7 is way better, then I'd consider it.

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MINK · Oct 12, 2011

6.7 with the twins you already have for the 5.9...EFI live that sob. Ditch all the emissions before it goes in..

Jason · Oct 12, 2011

What's making you want to swap platforms? You ever get the lift off that truck?? No matter what you put in it, that truck is badass and I'm not a cclb fan!

Jeff@Spartan · Oct 12, 2011

6.7 fo sho. Black's Diesel Performance proved that the 6.7 can go a long damn way.

powerstrokedub · Oct 12, 2011

6.7l fo sho' the blocks are stronger in the 6.7l and its capable of making an incredible amount of torque.

Deputydog · Oct 13, 2011

5.9 CR :toast:

me2 · Dec 4, 2011

I vote for the 6.7. I'm putting one into an 08 myself.

I have a '99 with a 5.9CR and it was good too.

EFI Live is going to make either engine great, but the 6.7 has more potential built in.

TyCorr · Dec 4, 2011

6.7 is a great motor....its torquier than the 5.9 in my experience. Choosing between one or the other is like splitting hairs especially when the thing will be tuned to the nuts.

tylerdillard · Dec 4, 2011

5.9 is a better platform. Id go with that

me2 · Dec 4, 2011

tylerdillard said:
5.9 is a better platform.

how do you figure that ?

Curtis@Vision Diesel · Dec 4, 2011

5.9 get my vote

smokedout250 · Dec 4, 2011

5.9 cr gets my vote although I'm starting to hear good things about the 6.7's

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charlie-2 · Dec 4, 2011

6.4l........LOL id say 6.7

Powerstroked162 · Dec 4, 2011

tylerdillard · Dec 5, 2011

Alot of the higher hp 6.7s have had a few issues lately. Some builders that tried 6.7s are back to 5.9s. It's just a proven baseline.

tylerdillard · Dec 5, 2011

By issues I mean cracking blocks. 6.7 is not a better block than a 5.9

forcefed6.4ford · Dec 5, 2011

What are the hp levels that the 6.7is cracking? I have heard that rods are a must for the 6.7 once you get over 650hp due to aggressive torque spikes at lower rpms.

Powerstroked162 · Dec 5, 2011

forcefed5.9ford said:
What are the hp levels that the 6.7is cracking? I have heard that rods are a must for the 6.7 once you get over 650hp due to aggressive torque spikes at lower rpms.

I don't know about any of that. Im not a CumminGs guy by any stretch. A friend of mine who did a bunch of 6.7 stuff with H&S has pulled down 680 something on fuel without issue. He is beta testing EFI live stuff for the 6.7. I think with that in itsel, it should help keep engines alive. I could be wrong but considering any other companies hottest stuff out there right now, laid over into EFI live looks a tad rough LOL Which is expected. EFI should help refine that stuff a ton.