Mopar's Infamous Hemi
Home | News | Search | Engines | Registry | Forums | Classifieds | Full Menu
Hemi Engine Database

2003 Dodge Ram 345
Model Number:
Size (cu-in) 345
Power (hp) 345 @ 5600
Torque (lb-ft) 375 @ 4400
Bore (in) 3.92
Stroke (in) 3.58
Compression 9.6:1
Carburetor SMPI
In Valves (in) 2
Ex Valves (in) 1.55
Firing Order 1-8-4-3-6-5-7-2
Left Bank
Right Bank
Dry Weight (lbs) 590

  • High-nickel, cast grey-iron block
  • Deep-skirt block with 9.25" deck
  • Cross-bolted main bearing caps
  • Cam tunnel is 7.44" above the crank

  • Nodular, sand-cast iron crankshaft
  • 6.25" powdered-alloy connecting rods
  • Cast aluminum, low-friction pistons

  • Aluminum cast Hemi cylinder heads
  • 85cc hemispherical combusion chambers
  • 1.65:1 ratio, large-pad cast rockers
  • Tuned-runner nylon plastic intake manifold
  • 80mm bore single-blade throttle body

  • One coil pack per cylinder for dual plugs
  • Each is fired despite the other's condition
  • Returnless fuel system with pump in-tank
  • Vibration damper is press-fit onto the crank

  • 30" long from back to front of water pump
  • 26" wide at widest point of valve covers
  • 34" high from stock oil pan to stock manifold

  • Ram 1500s have 1 big cat and no resonator

  • Click here to return to full listing.

    Home | News | Identify | Engines | Castings | Forums | Classifieds
    Registry | Reader Rides | Hemi Swaps | Tips & Tricks | Pictures | Gallery
    Notables | Calcs | History | Clubs | Links | Search | Racing | Aftermarket
    Resource Centers: 5.7L HEMI | 6.1L HEMI | 6.2L HEMI | 6.4L HEMI
    © 1996-2024 Scott Moseman <email>
    Chrysler, Dodge, Jeep, RAM and Mopar are registered trademarks of Stellantis.