6.4 HD vs SRT cam for DD 5.7 4x4?

[hal9000]

So I posted this in the wrong forum a week or two ago and didn't get much response. Figured I'd repost here...
I need to do a cam/lifter swap in my 2012 5.7. 4x4. Wondering whether the SRT cam would make a better upgrade than the 6.4 HD truck cam? Assume stock manifolds for now (if I can find a set of 100% bolt on shorty headers I may eventually do those), 3.55 gears, and mostly light on/off-road, hunting/camping and light/med duty towing. Currently running stock rebel wheel/tire (285x17).

Any info that anyone has comparing performance, driveability, or fuel economy between the two as swap options would be welcome!

Thanks everyone

 

[Bigskyroadglide]

If I ever have to put a cam in one of my 5.7s, my intent is to try and use one of the more performance oriented cams from one of the SRT groups.

 

[DILLIGAF]

Skip the OEM crap and get yourself a proper cam. like a Flyin' Ryan Performance / Jay Green / Moes

They all offer DD cams.

The Trans tune is 10x more important with the ****** 65RFEs.

 

[hal9000]

What's wrong with the 65rfe?

Also, fwiw I'm not trying to max out performance, just get the best balance of real world usability, with a little added fun on the occasions I mat the throttle.

 

[hal9000]

Thanks for the input as well. I'm really planning to stick with or (and keep the mds), but I'll take a look at the aftermarket cams too

 

[DILLIGAF]

What's wrong with the 65rfe?

Everything, Just google it...

 

[hal9000]

Shoulda caught it earlier, bit I guess it's a good thing I have the 66rfe in my truck

 

[jambbii]

I have done this swap. I d0 have custom tune as well. I think the cam cost me 78 bucks and the valve springs were under 200 bucks. This is in my wife's DD and the only reason I didn't spend money on a better cam is just because I had a cracked cylinder head and this was not a planned mod so I figured why not while I had it apart.

 

[burner71]

I did the 6.4 truck cam and mopar performance springs. I have a 2500 so I do not have MDS, I had Hemi Fever adjust the tune a bit to not throw misfire codes now and then since this cam is for MDS. I also have the 66RFE. The truck has a lot more power than it did stock for sure, you really feel it in the mid to upper bands and when the runners adjust, almost like a turbo boost feeling.

 

[NoriegaBrosMotors]

I have done this swap. I d0 have custom tune as well. I think the cam cost me 78 bucks and the valve springs were under 200 bucks. This is in my wife's DD and the only reason I didn't spend money on a better cam is just because I had a cracked cylinder head and this was not a planned mod so I figured why not while I had it apart.

What cam did u put in 392? Can you share your tune for this swap?