There's always the V12 27.0L Rolls Royce Meteor (tank version of the Spitfire's Merlin engine) which is de-tuned to 600bhp (but with 1550lb/ft @ 1,600rpm) into Rover SD1 swap!
www.youtube.com/watch?v=85jfBxQP4ZI http://www.ppcmag.co.uk/old-car-info/rover...-litre-v12.html (
look where it is!) The de Havilland Hornet version of the Merlin had 25psi from a centrigal supercharger, making 2,060bhp on really silly 150 octaine fuel. I love this quote about the Merlin: "The Merlin consumed an enormous volume of air at full power (equivalent to the volume of a single-decker bus per minute), and with the exhaust gases exiting at 1,300 mph (2,100 km/h) it was realised that useful thrust could be gained simply by angling the gases backwards instead of venting sideways. During tests, 70 pounds-force (310 N; 32 kgf) thrust at 300 miles per hour (480 km/h), or roughly 70 horsepower (52 kW) was obtained which increased the level maximum speed of the Spitfire by 10 mph..."