 The K-Series was previously available only with a developed version (bored out to 384 cubic inches (6.3 L) in 1928 and uprated to 125 hp for 1932) of the 60° V-8 which first saw duty in the 1920 Lincoln L-Series.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.