 The expanded engine offering split the K-Series into KA- (powered by the 60° V-8) and KB-Series (powered by the 65° V-12).In 1933 Lincoln introduced a smaller V-12 to replace the ageing V-8 in the KA-Series.Its 67° architecture was a significant departure, with four main bearings, offset blocks, and side-by-side connecting rods rather than fork-and-blade.