Dodge Royal Lancer D-500
The 1955 Dodge was all-new with a longer 120 in (3048 mm) wheelbase and 212.1 in (5387 mm) overall length than the 1954 cars. They shared their basic mechanicals with the De Soto, but featured special styling. These cars lasted through the 1955 and 1956 model years before being replaced by the all-new 1957 design.
The 1956 D-500 was a high-performance model derived from the standard 1956 Dodge but differing in many ways. It included a heavy duty suspension and other chassis upgrades from the New Yorker and Imperial lines, upgraded brakes, and a high-performance 315 in³ (5.2 L) Hemi-head V8. A four-barrel Carter carburetor pushed output to 260 hp (194 kW) and 330 ft·lbf (447 N·m). The 3-speed manual transmission was standard, with the PowerFlite 2-speed automatic as an option. The D-500 originally used only the Coronet 2-door sedan and Royal Lancer hardtop and convertible bodies.
Source: Wikipedia, 2011