My tractor has a engine spec plate on the side of the block in front of the injector pump. It contains all the EPA stuff and output power. It should say something like " this engine meets all aplicable emissions standard for ________." mine says 2009. That would be about as close as you could get that is actually attached to the tractor. Also the last two digits in my serial number are E9, they are seperated from the first 8 characters. I may be wrong but I am willing to bet that it also means 2009. Hope I am not leading you in the wrong direction.