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 ).
The 114's pushrod V8 engine underwent modifications, with its stroke lengthened from  to , paired with a larger bore, leading to an increased displacement from  to , which remained one of the largest passenger-car engines ever built for the model (Cadillac produced a  engine, enlarged to ).