13 Liter
Specs
Model Number 13 Liter Combustion System Spark-ignited Cooling System Water-cooled Displacement 765 cid (12,500 cc) Compression Ratio 9.75:1 Bore & Stroke 5.00 in x 6.50 in (127 mm x 165 mm) Fuel Type NATURAL GAS (NG), PROPANE (LP) Direction of Rotation Counter-clockwise viewed on flywheel