Truck Version 6.4 Hemi Worth a Cam Swap?

New Hemi Engine Swaps

  1. 72DMag

    72DMag Well-Known Member

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    HI, I have the chance to pick up a low mileage (64k) 2017 ram 6.4L hemi out of a 2500 ram truck. I know that they are lower compression compared t0 the car version and the intake on them is designed more for low end torque compared to high rpm horsepower of the car version. The plus side is its a bge block which is a beefier.

    My question is with just a cam swap and keeping the stock valvetrain what horsepower could this see at what rpm? Can I get close to the 392 hemi car version found in the challengers? Also, would a cam swapped 5.7 make more hp?

    Ask because the duster is sitting there with an empty engine bay and the price for the 6.4 out of the truck is only $1500. Which imo is a great deal for that age and mileage.
     
  2. 408 swinger

    408 swinger FABO Gold Member FABO Gold Member

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    That is a great price! That intake has the short runner system. I've heard they are better than the car because of the extra height. Might cause issues with hood clearance. The cylinder heads are basically the same, but, the truck head is cast from same alloy as Hellcats. Boost ready! With cam swap(lock out the VVT) and headers, 500 should be a breeze.
     
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    • 72DMag

      72DMag Well-Known Member

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      @408 swinger So you think with stock valvetrain and the truck intake making 500 hp at 6k to 6200 is still possible? Have a cam grind in mind.

      Yeah i think I'm gonna snatch it up. Thanks
       
    • 408 swinger

      408 swinger FABO Gold Member FABO Gold Member

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      You'd want to make sure the runners are in the "long" position. Might be worth a shout out to @Johnny Mac. He was working on an SRT 392 crate at Blueprint. Not sure if they were camming those or not. His 5.7 crates when he was at Pace were making like 485 hp.
       
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      • Johnny Mac

        Johnny Mac www.blueprintengines.com FABO Vendor

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        The only knock against the truck engines is they are a little "uglier" than the car versions, and the timing cover is kinda clunky. No issues with the truck intake if you want to use it, but you would probably have to swap timing covers if you wanted the car intake for clearance issues.
        A healthy cammed 6.4 will flirt with 600 hp. You'll EASILY go beyond 500. Just lock out the vvt while you're in there. I believe the truck engines are 410 hp stock. I'm not sure how aggressive you want to go, but I have a oe hellcat cam if interested.

        The BluePrint Hemi we're working on ended up growing to a 426 cid engine. We played with some 5.7's and some hellcat longblocks in R&D. The BGE block was the winner.

        The 6.4 heads are all pretty much the same, beyond the intake bolt positions for the hellcat blower on those heads. Car vs truck only differ due to egr I think. Maybe valve material, but that's all.

        You have a nice foundation for $1500!!!
         
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        • 72DMag

          72DMag Well-Known Member

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          Thanks guys!! @408 swinger @Johnny Mac

          I appreciate all the info!! I knew it was a good price but needed to confirm the truck engines are still worth obtaining and building. I knew some of the differences but I have not paid attention to them as much. The truck had a fire in the cab so the plastic cover and a couple coil packs are toast. I'll take a close look when I get it back to the garage.

          @Johnny Mac thanks for the camshaft offer. Not sure of the details of that cam and how it works with the stock springs. I haven't' done research into them yet but I will keep you in mind. Since the truck engine has lower 10.0:1 compression compared to the 10.8/10.9 for the cars I'd like a cam with an appropriate lsa to match and something that closes the intake valve a little early to build up the static pressure in the chamber some more. Again I haven't researched the cams enough yet.

          Thanks again!!
           
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