The T51 was entered into championship races by a further twelve organisations, the most notable being Reg Parnell, who later took over Yeoman Credit's racing activities from BRP, and Fred Armbruster, who entered Pete Lovely in the 1960 United States Grand Prix with a T51 uniquely fitted with a Ferrari Tipo 555 engine, a different engine to those used by Scuderia Eugenio Castelotti. The final World Championship appearance for a T51 came when Trevor Blokdyk took his Scuderia Lupini T51-Maserati to twelfth place in the 1963 South African Grand Prix.