1950 saw the introduction of the FIA World Championship of Drivers. In response to improvements to the Alfa 158 and the already competitive Ferrari and Talbot, Maserati again upgraded the 4CLT's engine. A multi-part crankshaft, lightened and balanced rods, a more powerful pair of superchargers and changes to the ignition timing took engine output up to a claimed . Coupled to shedding from the car's weight, this brought the Maserati up to near-Alfa levels of performance. Although moderately competitive in short runs, the final upgrades proved to be too much for the decade-old powerplant's design and the 4CLT's Grand Prix performance was hindered by engine failures. The season's only Formula One wins came in non-Championship events. Fangio won the Pau Grand Prix on the same day as Parnell took the Richmond Trophy at Goodwood. David Hampshire won the Nottingham Trophy later in the year. Fangio also won the Formula Two Ramparts Grand Prix, at Angoulême, in a 4CLT chassis fitted with an A6GCM engine. The Milano team modified a 4CLT for use in 1950 and 1951, but without success.