Originally the 8.0L made 350 hp / 450 ft lbs of torque.Same parts as engine was built with.Production was 300 hp/415 lbs ft IIRC. Cal was changed to satisfy the trans group.Pulled the advance out of the cal (good-bye mileage). Later a dual throttle body version was tested but not built (350 hp/500 ft lbs of torque). Mopar Perf claimed a fifty or more hp gain with a cam they listed in the MP catalog for a while.

Engine had an issue with oil drain back (cyl hd design issue) and crank windage. Above 4400 the engine badly needed a different (deeper) oil pan with a tray as stock pan was very close to crank.Serious oil pressure problems killed the hp (peak hp was @ 4800) version. It was on schd for 2004. Powers to be decided it wasn't needed as the 5.7L was ready.