The iron block was also used for smaller displacements; starting with the very successful 1599 cc Formula Atlantic BDD in 1970, followed by the 1098 cc BDJ and 1300 cc BDH variants for SCCA Formula C and sports car racing, respectively. There was even a one-off 785 cc version built by Cosworth employees Paul Squires and Phil Kidsley; fitted with a Lysholm supercharger it was installed in a Brabham BT28 Formula 3 chassis and competed in the British Hill Climb Championship as the Brabham-Lysholm.