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Handbook / Swaps / R2.8 crate engine

Chapter 7 Mods and swaps

The Cummins R2.8 crate engine

The R2.8 is a four-cylinder Cummins sold as a crate engine for repowering older vehicles. Cummins is unusually direct about where it can and cannot legally go.

What Cummins says

  • It is aimed at older light trucks and cars. Cummins says it is generally suitable for 1999 and earlier light trucks and 1993 and earlier cars, depending on local rules.
  • It is not CARB approved, and Cummins says it does not sell it in certain states and provinces.
  • The installer is responsible for legal compliance.
  • It is not a bolt-in: the install guide covers mounts, cooling, fuel, wiring and controls.
  • A repower does not raise the vehicle's towing rating.

For the classic used-engine route, see 4BT and 6BT swaps.

Where this comes from

Last reviewed 2026-10-19. General information only: your owner's manual and service information come first.