I stand corrected if you were comparing the 603 motor (6cyl) to the 617 (5cyl). I agree with speedy300D, the 6 cyl is faster. Now which one will run the longest.....? my money goes with the 617 motor. I assumed that you were asking to compare the long sedan with the standard sedan, same years.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.