This first FirePower engine, used from 1951 to 1955, has a bore of 3.8125 in and a stroke of 3.625 in for a piston displacement of , and a deck height of 10.32" ("low deck"). The bore pitch, shared by all Chrysler FirePower engines, was 4.5625", the largest of any 1st generation hemi engines. Most used a two-barrel carburetor and produced , with the famous exception of the 1955 Chrysler C-300 equipped with dual Carter WCFB four-barrel carburetors and rated at 300 hp.