Chrysler 5.7L Hemi V-8

5.7L Hemi Specs, History, and Information

That thing gotta hemi? After a long hiatus, Chrysler reintroduced the Hemi to its engine portfolio for the 2003 model year. It's first application would be the Ram 1500, 2500, and 3500 pickup models, however the engine would find homes in many Chrysler products beginning in the 2004 model year. The engine is and has been produced at Chrysler's Saltillo Engine Plant in Ramos Arizpe, Mexico. The 90 degree pushrod V-8 features hemispherical shaped combustion chambers, providing improved breathing of the cylinder head during the intake and exhaust strokes resulting from the canted angle of the valves.

The engine's greatest disadvantage, at least for truck applications, is its sharp torque curve that peaks at relatively high engine speeds. This characteristic lacks the low end torque favored in applications where towing and hauling needs are frequent and requires operating at higher engine speeds to realize the engine's full performance. On the contrary, the engine produces respectable peak horsepower and torque considering it displaces a mere 345 cubic inches. To help with emissions and address flame propagation concerns inherent of most engines with hemispherical combustion chambers, the 5.7L utilizes a dual spark plug design with a secondary spark plug firing at the start of the engine's power stroke.

The 5.7L Hemi underwent many changes for the 2009 model year, including a higher compression ratio, active intake manifold, variable camshaft timing, and a multi-displacement system (MDS). The active intake runner system allows the engine to utilize short and long runners in the intake manifold. To increase low end performance, the short intake runners are blocked off and air flows through the long intake runners at low engine speeds. At higher engine speeds, the intake manifold opens up the short runners for improved top end performance. The multi-displacement system deactivates cylinders 1, 4, 6, and 7 under low load conditions to improve fuel economy.

5.7L Hemi V-8 Specs


Chrysler 5.7L Hemi V-8


90° pushrod V-8

Assembly Plant(s):

Saltillo Engine Plant, Ramos Arizpe, Mexico


2003 - current Ram 1500/2500/3500
Many Chrysler car/SUV applications - these specifications focus on the Ram truck version


345 CID, 5.7 liters

Firing Order:

1 - 8 - 4 - 3 - 6 - 5 - 7 - 2


3.917 in (99.49 mm)


3.578 in (90.88 mm)

Compression Ratio:

9.6 : 1 (2003 - 2008 model years)
10.5 : 1 (2009+ model years)

Engine Block Material:

Cast iron

Cylinder Head Material:

Cast aluminum alloy


Naturally aspirated


Coil-near-plug, 2 spark plugs per cylinder


2 valves per cylinder, OHV pushrod V-8, hydraulic roller lifters, variable valve timing (VVT/VCT, 2009 MY+)

Fuel Injection:

Multi port sequential fuel injection

Fuel Requirements:

Regular unleaded gasoline (premium fuel recommended, not required)

Oil Capacity:

7.0 qts w/ filter change

Engine Weight:

~ 500 lbs

Peak Horsepower:

2003 - 2008 Ram 1500/2500/3500

345 hp @ 5,600 rpm

2009 - 2012 Ram 1500

390 hp @ 5,600 rpm

2009 - current Ram 2500/3500

383 hp @ 5,600 rpm

2013 - current Ram 1500

395 hp @ ,5600 rpm

Peak Torque:

2003 - 2008 Ram 1500/2500/3500

375 lb-ft @ 4,400 rpm

2009 - 2012 Ram 1500

407 lb-ft @ 4,000 rpm

2009 - current Ram 2500/3500

400 lb-ft @ 4,000 rpm

2013 - current Ram 1500

410 lb-ft @ 3,950 rpm

Maximum Engine Speed:

5,800 rpm


Ward's 10 Best Engine List 2003, 2004, 2005, 2006, 2007, and 2009

5.7L Hemi V-8 Horsepower and Torque Curves

5.7L Hemi V8 horsepower and torque graph

2012 model year Ram 2500/3500 horsepower and torque curve for 5.7L Hemi equipped trucks