The Chrysler 5.7L Gen III Hemi and the Chrysler 6.4L differ in displacement, bore × stroke, compression ratio, factory rating. The table puts the factory specs side by side; each engine's own page has the full specs.
| Chrysler 5.7L Gen III Hemi | Chrysler 6.4L |
|---|
| Block | Cast iron, deep skirt, cross-bolted main caps | High-strength iron, 90-degree deep skirt, five mains, powdered-steel main caps; deck height 231.8 mm |
| Crankshaft / rods / pistons | -- | Forged micro-alloyed steel crank; powdered-metal forged rods 157.5 mm; cast aluminum pistons with full-floating 24 mm pins |
| Valves | Two valves per cylinder; 2.00/1.55 in (search-result text, unconfirmed) | 54.3 mm (2.14 in) hollow-stem intake, 42.0 mm (1.65 in) sodium-filled exhaust |
| Combustion chamber | -- | 73.4 cc |
| Ignition | Two spark plugs per cylinder, coil-on-plug | (Gen III Hemi family: two plugs per cylinder) |
| Cylinder deactivation | MDS (shuts off four cylinders) from 2005 in 300C, Magnum RT, Grand Cherokee | Fuel Saver Technology (four cylinders) in cars with automatic transmissions |
| Variable cam timing | Added for 2009 (5.7 power rose to 357-395 hp) | Intake and exhaust cam phasing on the single cam, up to 37 degrees (VCT introduced on the Hemi in 2009) |
| Intake / throttle | Integrated Air Fuel Module; sequential returnless multiport EFI; electronic throttle | Active intake manifold with switching valves (variable-length runners); 80 mm throttle body; thermoplastic |
| Mass | -- | 252 kg (554 lb) |
| Factory recall (5.7) | NHTSA 23V-265: 2021 Ram 1500 with 5.7L eTorque - PCM software may cause incorrect fuel mixture and engine stall | -- |