i'm not 100% sure actually. i'm not a car/engine guy, and i needed to buy something kind of fast because my old truck was wrecked so i didn't have time to do the research i would have liked, and i didn't even realize that there was a hemi option so i didn't ask about it. i'll figure out for sure what it is when it's daylight, but i'm pretty sure it's the 4.7 v8.