Mercurys-Lincolns-Ford Trucks & Racers
All Mercurys from 1939 (the 1st year) up through 1953 used Flathead V-8 engines. The Mercury engines were slightly larger in displacement (255 cu.in. as compared to the Ford with 239 cu.in.) and, of course, more powerful.
All LINCOLNs from 1936 to 1951 used a Flathead Engine BUT: the Full-Size Lincolns had a bigger 337 cu.in.engine.
In 1952 Lincoln debuted Fords 1st OHV engine (317 cu.in.), which became famous for winning the Mexican Road Race
(La Carrera Panamericans) 3 years in a row - 1952-1954.
The Ford Flathead Engine opened up a whole new "Era" in Racing as it was affordable to the "Average Guy". Racing would no longer be only for "Rich Guys". As a result, many forms of Racing evolved - each led by Fords - at least in the Beginning.
Ford Trucks used basically the same engine as the passenger cars - sometimes with small differences. As a result the bigger trucks were pretty underpowered. So; Ford put the bigger Lincoln engine into the 1949 and later big Ford Trucks.
Check this out - the 1949 Mercury
Oct 2004 TFRB