6.5 Liter Turbo Diesel. RPO codes L56 and L65. L56 has EGR emissions equipment. L65 had no EGR. L65 most common in 3500's. L65 was considers a "high output" package.
At the engine the numbers are 215 HP @ 3200 RPM and 440 ft-lb @ 1800. This is for the L65 motor.
Depending on year.. as low as 145hp in the L65 in the mid 70's 295hp "gross" in the first in 1967 370hp "gross" in the original 1970 lt-1 405hp 1993 ZR-1 350 was the highest production 350 at 405hp
Good question- the MV ( as it was dieselized) Kalizma. the Ship survives and is used for charter work. about l65 feet. originally built as a steam yacht in l906. Do not confuse with U.S.S. Taylor ( destroyer) or the S.S. Queen Elizabeth (I)/