Ram Hemi 5.7 Specs: 3.917 x 3.579 in, 345-383 hp

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Ram Hemi 5.7 specs: 345 ci (5.7L) 8-cylinder, 3.917 x 3.579 in (99.5 x 90.9 mm) bore and stroke. Rated 345-383 hp, 2003–2018. Used in the Ram 1500. OHV.

The Ram Hemi 5.7 is oversquare — the 3.9173" bore exceeds the 3.5787" stroke by 9.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.5787" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 43.1 ci (707 cc).

It is one of 10 engines in the Hemi family, the smallest at 345 ci. 19 factory variants share these dimensions, rated from 345 to 383 hp across 2003–2018.

Dimensions

Displacement	345 ci / 5.7 L
Bore	3.9173"
Stroke	3.5787"
Cylinders	8
Configuration	V8
Bore/stroke ratio	1.095

Construction

Block material	cast iron
Head material	aluminum
Valvetrain	OHV
Fuel type	gas
Advertised HP	345–383 hp
Years	2003–2018

What these numbers mean

Bore/stroke character	1.095 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves
Mean piston speed at 6,000 RPM	3,579 ft/min — in the range typical of performance street engines
Displacement per cylinder	43.1 ci

Run the numbers for this engine

Each link opens the calculator with this engine's specs already filled in.

• Displacement from bore and stroke (calculator)
• Static and dynamic compression ratio calculator
• Piston ring gap for this bore
• Piston speed at any RPM
• Horsepower to torque at any RPM
• What size carburetor (CFM calculator)

Variants sharing these dimensions (19)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

Year	Advertised HP	Code
2003	345 hp	Hemi 5.7
2004	345 hp	Hemi 5.7
2005	345 hp	Hemi 5.7
2006	—	Hemi 5.7
2006	345 hp	Hemi 5.7
2007	—	Hemi 5.7
2007	345 hp	Hemi 5.7
2008	—	Hemi 5.7
2008	345 hp	Hemi 5.7
2009	355 hp	Hemi 5.7
2010	383 hp	Hemi 5.7
2011	383 hp	Hemi 5.7
2012	383 hp	Hemi 5.7
2013	383 hp	Hemi 5.7
2014	383 hp	Hemi 5.7
2015	383 hp	Hemi 5.7
2016	383 hp	Hemi 5.7
2017	383 hp	Hemi 5.7
2018	383 hp	Hemi 5.7

Factory cars with this engine

• Ram 1500: 2003, 345 hp; 2004, 345 hp; 2005, 345 hp; 2006, 345 hp; 2007, 345 hp; 2008, 345 hp
• Ram 2500 and 3500: 2003, 345 hp; 2004, 345 hp; 2005, 345 hp; 2006; 2007; 2008; 2009, 355 hp; 2010, 383 hp; 2011, 383 hp; 2012, 383 hp; 2013, 383 hp; 2014, 383 hp; 2015, 383 hp; 2016, 383 hp; 2017, 383 hp; 2018, 383 hp

Similar engines

• Ram Hemi · 3.917" × 3.579" · 10.5:1 — 345 ci
• Ram EZB — 345 ci
• Ram EZH — 345 ci
• Ram Hemi (2009–2026) — 345 ci
• Ram Hemi 5.7 CNG — 345 ci
• Ram 59 Cummins 24V — 359 ci
• Chrysler 345ci · 3.920" × 3.580" · 10.5:1 — 345 ci
• Chrysler 345ci · 3.920" × 3.580" · 12.7:1 — 345 ci

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