The pushrod V8 engine of the 114 had its stroke increased from  to . With a  bore, this meant the capacity increased from  to , which was throughout the model's lifespan one of the world's biggest passenger-car engines (Cadillac produced a  engine, enlarged to ).
This engine developed 315 hp SAE Gross at 4,400 revs per minute and a substantial  at 2500 rpm. The car weighs , is  long,  wide, and  high.