I have over estimated the Nm of the engine, sorry about that
I found the correct details in the Tech Manual that I bought as per extract below.
And it was as you mentioned Multihull Thanks for the correction.
GENERAL DESCRIPTION
DESCRIPTION SPECIFICATION
Displacement 3.0L 3.0L (2985 cc) (182 CID)
Bore 83 mm (3.26 in.)
Stroke 92 mm (3.62)
Compression Ratio 18 :1
Weight 215Kg (474 Lbs.)
Power 160Kw (215 HP) @ 4200 RPM
Torque 510 N·m (376 Ft. Lbs.) @ 1800 RPM
Idle Speed - Warm 620 RPM
Belt Tension Automatic Belt Tensioner
Thermostat Opening 80°C ± 2°C (176°F ± 36°F)
Cooling System Capacity 13.3 Liters (14 qts.)
Engine Oil Capacity 9.5L (10 Qt.) W/Filter Change
Timing System Chain Driven Dual Overhead Camshafts
Air Intake Dry Filter With Turbocharger and Charge Air Cooler