Cummins 6B

The 6B/5.9L Cummins is used in many applications including step vans, uniform and commercial delivery vehicles. This engine is also used in various industrial and construction applications. In many instances, Pilot Engines can offer a custom engine remanufactured for your vehicle or equipment.
Reviva utilizes torque plating methods for boring and honing to ensure block straightness, which reduces break-in time and crankcase pressure. In addition, Reviva uses OEM or equivalent pistons, rings, bearings, valves and gaskets, making sure that this engine will stand the test of time.

All Reviva engines are assembled in the USA.

Product Bulletin



To determine correct part number and configurations available, please gather the following information from the valve cover: 

  • Original Engine Serial Number
  • Original Engine CPL


Long Block Supreme

  • Block
  • Rods
  • Crank Gear
  • Piston Assemblies
  • Crankshaft
  • Camshaft
  • Cylinder Head
  • Oil Filter Assembly
  • Rear Cover & Seal
  • Water Pump
  • Side cover/crankcase breather
  • Lifters, Pushrods, & Rocker Arms
  • Oil pump
  • Cam gear
  • Front gear housing
  • Oil cooler
  • Valve cover(s)
  • Gasket set


Complete Drop-In
all parts on the Long Block Supreme plus

  • Lift pump
  • Low Pressure Lines
  • High Pressure Lines
  • Fuel Filter Assembly
  • Intake Cover
  • Intake Connection
  • Oil Pickup Tube
  • Injectors
  • Damper pulley
  • Thermostat
  • Thermostat Housing
  • Gear Cover & Seal
  • Exhaust manifold
  • Oil pan
  • Fuel Filter Assembly
  • Injection Pump
  • Turbocharger
  • Air Crossover*
    *as required







Dynomometer Testing

All of Reviva’s Complete Drop-In engines are 100% dyno tested prior to shipment. Computer controls ensure that each engine dyno test is conducted under standard, repeatable settings. Every engine is run through a warm up cycle; three separate cruise segments simulating light, medium and heavy throttle conditions; maximum torque and horsepower tests; both high and low idle tests; and a black light leak detection test with dyed oil, coolant and fuel.

Warranty Coverage

On-Road Complete Drop-In configurations: 2yr/unlimited mileage.
**2nd year long block coverage only.
Off-Road Long Block or Complete Drop-In configurations: 1yr/2,000 hours.
On-Road Long Block configuration: 1yr/unlimited miles.  Transit applications: 1 year.

Some restrictions apply; see limited warranty details or call for more information.