Shovelhead Alternator Rotors Differences and Spacers

Okay this is not a rocket surgery post, but it took us a few emails and calls back and forth to get it ironed out. We already had the pictures from the exchange and I'm sure someone else might get helped from this post.

Hyram calls me and says, "hey, what do I do with these spacers and the rotor on this shovelhead that I'm building."

I said, "I don't remember any spacers or washers on my rotor."

This is the picture of his parts he sent me. A thick fender washer and standard washer that fit the engine mainshaft.


My primary was apart because I was looking for leaks earlier in the day.


Here's the outside of my rotor. His rotor is flat and mine has this raised section. So the thick fender washer goes on the outside of a flat rotor.


Here's the inside of my rotor. Again mine is built with a raised section in the middle and his is flat. So the standard washer goes on the inside of his.


This is the mainseal spacer that the inside of the rotor or rotor standard washer tightens against for reference.