Displacement: 855 in³ (14.0 L)
Configuration: Inline 6-cylinder
Aspiration: Naturally aspirated, Turbocharged, or Turbo/Aftercooled
Fuel System: Mechanical (PT pump)
Cooling: Water-cooled
Typical Speed: 1800–2100 RPM (application-dependent)
NH855 – Naturally aspirated
NT855 – Turbocharged
NTA855 – Turbocharged & aftercooled
Big Cam I–IV (855) – Updated cam & fueling generations
855-G / G-series – Generator-drive versions
| Version | HP Range |
|---|---|
| NH855 | ~250–300 HP |
| NT855 | ~300–400 HP |
| NTA855 | ~350–525 HP |
| Big Cam 855 | ~350–600 HP |
| Generator Sets | ~250–500+ kW |
(Exact rating depends on CPL, fuel setting, and RPM.)
Extremely durable block & crank
Simple mechanical fuel system
Easy to rebuild and tune
Excellent for continuous-duty oilfield & industrial use
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