When Chrysler announced it was bringing back the legendary Hemi in the early 2000s, it was a big deal. This new series of Hemi engines is often referred to as the “Gen. 3” after the first generation FirePower (1951-59) and second generation Elephant 426 (1964-71).

Note: This Spec Guide is part of a series of Hemi Engine Spec guides we’re putting together. See Other Hemi Engine Spec Guides Here.

Introducing the 6.1L Hemi & the SRT-8s

It didn’t take long for the demand for more power from the 5.7L Gen III Hemi introduced in 2003 to spawn a larger displacement 6.1L Hemi engine. Its larger bore helped breathing through the new Eagle style heads. This engine was born directly out of Chrysler’s SRT performance arm and used exclusively in SRT-related platforms. This engine can be immediately identified by its unique barrel-shaped aluminum intake manifold, as it was the only Gen III Hemi to use this material in the intake. It’s also regarded as a transitional engine that eventually led to even larger displacements of 6.2L and 6.4L.

This Engine Guide is Specifically for the 2005-2010 Mopar Gen. III 6.1L Hemi.


VIN Identification: The 8th digit in the VIN designates the engine in the vehicle—W= 6.1L V8 CYL SRT HEMI Gasoline MPI.


2005-10 Mopar Gen. III 6.1L Hemi Engine Performance

Mopar 6.1L Hemi Performance Ratings
Compression Ratio10.2:1
Horsepower 425 @ 6,200 RPM
Torque420 lb.-ft. @ 4,800 RPM

2005-10 Mopar Gen. III 6.1L Hemi Vehicle Applications

2005-10Chrysler 300C SRT-8
2008-10DodgeChallenger SRT-8
2006-10Dodge Charger SRT-8
2006-08DodgeMagnum SRT-8
2006-10JeepGrand Cherokee SRT-8

2005-10 Mopar Gen. III 6.1L Hemi Engine Block Specs

Mopar 6.1L Hemi Block Specs
Casting Number05037388AB
Displacement6.1L / 370 c.i.d.
Bore Dia.4.055"
Deck Height9.25"
Bore Spacing4.46"
Thrust Bearing LocationNumber 3
Main Cap Style2 Bolts with Lateral Cross-Bolts
Cam-to-Crank Centerline7.44"
Bellhousing Bolt Pattern Same as Earlier Magnum LA V8 Small Block, but with Top Center Bolt Eliminated

2005-10 Mopar Gen. III 6.1L Hemi Engine Rotating Assembly

Mopar 6.1L Hemi Engine Rotating Assembly Specs
Piston MaterialHypereutectic
Piston StyleFlat Top with Valve Notches (Note: All notches are NOT the same.)
Piston Ring Package1.5mm, 1.5mm, 3.0mm
Wrist Pin Diameter0.984" (25mm)
Connecting Rod MaterialPowdered Metal
Connecting Rod StyleI-Beam
Connecting Rod Length6.242"
Connecting Rod Bearing Bore2.125"
Crankshaft MaterialForged Steel
Crankshaft Main Journal Dia.2.559"
Crankshaft Rod Journal Dia.2.126"
Crankshaft Reluctor Count32x
Crankshaft Mounting Flange8 Bolts

2005-10 Mopar Gen. III 6.1L Hemi Engine Cylinder Heads

Mopar 6.1L Hemi Engine Cylinder Head Specs
Casting Number5037369AA
Cylinder Head MaterialAluminum
Combustion Chamber74cc
Intake Port ShapeSquare
Intake Runner Volume188cc
Exhaust Port Shape"D" Shaped
Exhaust Port Volume57cc
Intake Valve Diameter2.075"
Intake Valve DesignHollow Stem
Exhaust Valve Diameter1.58"
Exhaust Valve DesignHollow Stem, Sodium Filled
Cylinder Head Bolt StyleTorque to Yield (TTY)
Cylinder Head Bolt SizeM12 x 1.5mm & 8mm

2005-10 Mopar Gen. III 6.1L Hemi Engine Cam Specs

Mopar 6.1L Hemi Engine Camshaft Specs
Adv. Duration @ 0.006" (Intake/Exhaust)283 / 286
Duration @ 0.050" (Intake/Exhaust)221 / 225
Valve Lift
0.571" / 0.551"
Multiple Displacement System (MDS)?No
Variable Cam Timing (VCT)?No
Cam Journal Dia.57mm Front
(Note: Smaller to the rear.)

2005-10 Mopar Gen. III 6.1L Hemi Engine Valvetrain Specs

Mopar 6.1L Hemi Valvetrain Specs
Lifter DesignHydraulic
Lifter Link StylePlastic Holder
Lifter Body Diameter0.842"
Rocker Arm Mounting StyleShaft
Rocker Arm StyleDie Cast, Roller Fulcrum
Rocker Ratio1.60:1 (Intake)
1.66:1 (Exhaust)
Rocker OffsetNone
Valve Spring StyleBeehive
Valve Angle18° (Intake)
16.5° (Exhaust)
Timing Chain Guide StyleSpring-Loaded Tensioner

Other 2005-10 Mopar Gen. III 6.1L Hemi Engine Specs

6.1L Hemi Throttle Body, Fuel Injectors, Oil Pan & More
Intake ManifoldAluminum Barrel Shape
(Unique to 6.1L)
Throttle Body80mm, 4-Bolt
Throttle ControlElectronic
Fuel Injector Flow35 lb./hr. @ 58 PSI
Flex Fuel CapableNo
Fuel Injector ConnectorUSCAR, EV6
Camshaft Sensor LocationPassenger Side, Front
Oil PanVaries by Application
Oil PumpGerotor
Variable Cam Timing (VVT)No
Firing Order1-8-4-3-6-5-7-2
Total Weight, Full Dress578 lbs.
Author: Jeff Smith

Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Now he serves as a regular contributor to OnAllCylinders.