<VV> Alternator conversions need a lock nut!

[Ed Dowds]

There was one point that was missing from the thread on converting to alternators or upgrading to an internally regulated alternator:
The nut used to hold the Corvair specific alt fan is also Corvair specific.
The nut is a lock nut! 
If you look at a Corvair alt nut it is slightly crushed on the outside diameter above the wrench flats.
All the other GM cars used a plain nut.
The Corvair locknut is required because the reverse rotation of the alt on a Corvair tries to unscrew the nut! 
 
Ed