Showroom Stock RX-7 racers use the stock alternator without the fan blades on the front because it provides a couple extra HP and/or sheds a little weight?

I've heard it, but it seems too fishy to be true.

It just so happens that all the alternators I have are the type without the fan on the front. I've seen very few of them with the blades on them.

 

I don't know, but that s really weird

 

It is partially true. The full story is that RX-7 racers can remove the fan blades from the alternator if they place in the top 4 of an officially sanctioned Stock RX-7 Race.

Also it is a Mississippi State Law that once you mark a line , you have to go by it.