Well...I guess i was wondering about the definition of OEM just last night. Technically if I was running a Dart block wouldnt Dart heads be oem for the engine?? That would probably be legal for one year if I did do that, but we also are not allowed to externally modify the cylinder head. So the 990 heads are what I would be stuck with. Would I be able to make power at 9500 with those heads (I'm already planning on having a set ported to the max of course) I really dont want to build the longer stroke engine because that is what everyone else has, How can you be better than someone else by doing the same things they do right?