PSI 8.8L

Download Spec Sheet


  • Type: 90° 8.8L V8
  • Displacement: 537 cid 8.8L
  • Compression Ratio: 10:1
  • Valve Configuration: Pushrod Actuated Overhead Canted Valves
  • Manufactured: USA
  • Valve Lifters: Hydraulic Roller
  • Bore X Stroke: 4.35 in x 4.50 in (110.49 mm x 114.3 mm)
  • Main Bearing Caps: 4-Bolt Cast Iron
  • Balance Method: Internal
  • Intake Manifold: Factory-Installed Alternate Fuel Manifold
  • Fuel Delivery: LPG/NG/CNG Electronic Mixer
  • Oil Pan Capacity: 8 qt
  • Fuel Types: NG Biogas/ LPG/CNG/Dual/Bi-fuel
  • Engine Rotation: Clockwise (from the front)
  • Paint Protection: Component Painted
  • Horsepower: 260 hp @ 3000 rpm (Propane), 245 hp @ 3000 rpm (Natural Gas)
  • Torque: 530 lb-ft @ 1800 rpm (Propane), 500 lb-ft @ 1800 rpm (Natural Gas)
  • Shipping Weight: 729 lb (307.49 kg)

Standard Features

  • U.S. EPA-Certified and CARB-Compliant
  • Replaces GM 8.1L
  • Coil-near-plug ignition includes crankshaft sensor, camshaft sensor and eight ignition coils.
  • Cylinder Heads feature high-flow replicated ports with modern heavy-duty design. High flow head creates fast burn to improve efficiency and reduced emissions.
  • Industrial torsional damper with integral six-rib pulley to accommodate serpentine accessory drive hardware.
  • Tuned long-runner intake manifold provides higher torque while special air gap design keeps engine air cooler to improve efficiency.
  • Forged and nitride steel crankshaft creates durable block capable of 1000 ft-lb of torque.
  • Positive Crankcase Ventilation (PVC) system is integral to intake manifold (no valve requiread).
  • Coated cast aluminum 8-quart oil pan with full baffle and 12-mm drain plug.
  • Made in the USA.

Feature Focus

The coil-near-plug ignition system, with both crankshaft sensor and camshaft sensor, and multi-fuel capability.



  • Fuel options: LPG, NG, or CNG
  • SAE flywheel housings and flywheels
  • Auxiliary drive pulleys available
  • Radiators
  • Hood Packages
  • Sight Level Guages
  • Heavy Duty PTO Clutches, Inline and Side Load
  • Trailers


Fuel System Features

  • Closed-Loop Fuel System
  • Dual/Bi Fuel Capable
  • LPG (Mixer, Throttle Body, Fuel Lock, Regulator)
  • LPG w/Elec. Governor
  • LPG Electronic Mixer
  • NG/LPG Carb Dual Fuel
  • High Pressure CNG
  • NG Electronic Mixer
  • NG (Mixer, Throttle Body & Air Cleaner)
  • NG w/Elec. Governor
  • Three Way Catalyst standard
  • Alternative Fuels (Biogas, Syngas, Etc.)