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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) 2.00
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

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