'87 'vette. 28K miles and the alternator gremlin has gotten me.
What the trick to get the alternator pulley nut off?
I put a socket on the nut, and an allen wrench through the hole oin the socket in to the hex hole in the end of the shaft. Then grabbed the angled part part of the allen wrench with a 15" crescent wrench, and put a big pipe wrench on the socket. All that happened was that the allen wrench acted as a torsion bar.
It sure looks like it is a normal (lefty loosey) thread.
Chuck Tribolet