Cosworth solidified its association with Ford in 1969, by developing a double overhead camshaft (DOHC) 16-valve inline four-cylinder engine for road use in the Ford Escort. Working from the Kent block, Cosworth created a 1601 cc BDA for homologation purposes. The camshafts were driven by a toothed belt developed for Fiat 124, hence the name BDA, literally meaning "Belt Drive, A type". Running in Group 2 and Group 4 on either rallying or touring car racing, this engine could be enlarged to a maximum of 1975 cc. The nominal homologation at 1601 cc capacity meant that BDA-engined cars competed in what was usually the top class (1600 cc and up) so were eligible for overall victories rather than class wins.