3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
things I can think of that would cause issues: weight of new engine ( front ifs torsion bars may need to be beefed up to handle weight. if there was a conversion kit to coil over that would be awesome ), motor mounts ( if they aren't the same then fabrication will be required, if they are the same they still might need to be beefed up), wiring harness and other similar interfaces are more of an obstacle than issue, if you decide to do it I would get a fully dressed engine but you also gotta consider stuff like radiators and will you need a new computer.
it would help to know what year and model vehicle you currently have. I know mopar has sold factory crate hemi's fully dressed in multiple sizes. if you remember the gen 3 srt dodge pickup with the v10 viper engine. a buddy of mine bought a wrecked srt 10 and swapped the engine for his 5.7 and it was a plug and play, everything fit perfectly. only issue was transmission because the srt is standard tranny.
Yeah, pretty sure it's the same block, just with bigger sleeves.
Why 6.4L? Bigger isn't necessarily better ya know. It's definitely more expensive!
I would prefer a supercharged 5.7L or a supercharged 6.1L. It would just be cheaper in the end I would think and repairs would be as well.
I believe Arlington wants $18k for a 392 built block..lol
Is it just to say you have a 392? If it's the difference in power over a 6.1L, if you put a lower lift(towing) can in the 6.1L, you'll get much better results for a truck application. They need to rev too high to get their power.