SC rev limit rotor

[SpeedracerIndy]

Originally posted by Mike Kast
It fits under a normal cap? Why is this euro? What was on the American cars?

Euro SCs used this rotor to limit revs because the smog restrictions were not as tight as they are in the US. The US spec cars used (as I was recently informed) a relay behind the fuel gague, attached to the tach lead wire, that cuts off fuel at a specified value. And yes, that rotor will fit under a standard SC dizzy cap. There's some more info in this thread.