Napa Part No. Echlin MO-3000

Oklacarcollecto said

So without this rotor the HEI modification ends up doing what in the long run?

Click to expand...

Over time with a stock rotor it will arch burn the rotor tip and distributor terminals more.
It will work fine without it though too. (just a slight chance the spark might go somewhere else, like through the rotor to the distributor shaft)

Over time, those parts get worn out anyway.