FIA Period F Engine Specs
In European historic racing at the moment there is the theoretical spec you need to comply with (i.e. the homologation forms) and then there is the actual spec that different race organisers will permit without complaint. Disappointingly this latter category can deviate significantly from the first depending on the event, the organiser, who you are and the amount of money you spend with said organiser. There are some truly blatant cheats going on in many cases with the full knowledge of the race organiser. I know this from having spoken to scrutineers who have been directed to accept cars that don't comply. I myself bought an "FIA spec" car that had run in some of the biggest events in Europe and when we took the engine apart it was 3.0L not 2.0L!! Mind you that would explain the 915 gearbox it was also running! From what I understand it's the 2.0L Cup's ambition to strictly enforce the homologation specs and this will be a definite step in the right direction. It might create a bit of an arms race but it will be very interesting to see what the various tuners can do with a 65 engine.