So I have a 2003 Dodge Ram 2500 with the 5.7 hemi, and I want to upgrade from the high mileage motor I got to a 6.4. I've found low mileage used motors for under $10k. Would it be okay to run one of those or should I just the the 392 stroker kit. Current mileage is just under 214k miles needless to say it's a little tired. Any ideas would be highly appreciated.

 

You can't use a modern factory 6.4 because it's a VVT and MDS engine. You might not even be able to properly tune and run a stroker based on your engine because of the severe limitations of the 03 PCM.

 

Better to do a radiator cap upgrade.