Here is a complete list of Jaguar XJ12 Series I engine codes. It can help you order the right engine for your XJ12 Series I. It is always good to know the engine code as it can also help ordering other engine parts and ancillaries like cylinder head, gearbox etc. Other information you can know is the power, BHPs, year, Aspiration, cylinder valves and RPM of your Jaguar XJ12 Series I engine.