Both engines are big Mopar V8s, and each share numerous purposes. However, the engines are fairly totally different from each other. From the outset, the 5.7-liter HEMI is considerably smaller than the 392 (6.4-liter) V8, and sometimes makes much less energy. The previous adage “there’s no replacement for displacement” applies right here. Next, you must take a look at the applying of every engine. While each HEMIs are comparatively giant V8s which might be definitely able to placing out lots of energy, the 392 is decidedly made for increased efficiency purposes. 

As such, the 392 is barely obtainable on Ram 2500 vehicles, SRT Dodges, and a scant few Jeep Wranglers. Those are hardly run of the mill autos. The 392 cubic inch displacement is, in itself, a reference to the 1957 Chrysler 300C, which additionally housed a 392 V8. While not a weak engine by any means, the 5.7 HEMI has a extra humble use case. It’s the bottom engine for increased trim Durango fashions, and obtainable as an possibility on practically each trim of Ram 1500 truck. It’s a workhorse that occurs to be lots of enjoyable. 

The 392 is so much larger and extra highly effective than the 5.7-liter HEMI. However, if road cred is your aim, both engine will work — the HEMI badge speaks for itself.