Cadillac LMC55R engine

The Cadillac LMC55R is a naturally aspirated, four-stroke, 5.5 litre V8 racing engine built by the GM Racing and Performance Center team for the Cadillac V-Series.R LMDh prototype, which has raced since 2023. Cadillac developed the bespoke cross-plane engine for that car, and it is the first naturally aspirated engine among the LMDh manufacturers. Under the LMDh rules the combustion engine is paired with standardised hybrid components, a Bosch motor generator unit, a Williams Advanced Engineering battery pack and an Xtrac P1359 gearbox, so the engine is the part of the powertrain that Cadillac designs itself. Its only listed application is the Cadillac V-Series.R sports prototype.