I am a fairly new fan to the world of A Mod racing. In simple terms, what are the differences in engine rules between the 4 national sanctioning bodies. I know IMCA runs 604 Crate motors. But what about UMP, USRA/USMTS and Wissota? Does a team have to make many changes to run races between the series? Have there been discussions in the past about bringing the rules packages closer together nationally like there is in Super Late Models, or are egos in the way?
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