GM factory large Alternator pulley

[William]

There were two versions:

67 used a 3.6" diameter pulley with a hard-stamp part number 3829387 AI
68-up used a 3.2" diameter pulley, no part number.

Both were silver-cad plated. GMPD serviced 3829387 but it was incorrectly plated.

FWIW one of our customers was a rebuilder of starters and alternators. One of those pulleys was also used in aircraft applications.

[BCreekDave]

Originally Posted by William

There were two versions:

67 used a 3.6" diameter pulley with a hard-stamp part number 3829387 AI
68-up used a 3.2" diameter pulley, no part number.

Both were silver-cad plated. GMPD serviced 3829387 but it was incorrectly plated.

FWIW one of our customers was a rebuilder of starters and alternators. One of those pulleys was also used in aircraft applications.

How do we account for this:

http://chevynova.org/1970LT1_Engine.html

wrong alternator?

[rszmjt]

Originally Posted by BCreekDave

How do we account for this:

http://chevynova.org/1970LT1_Engine.html

wrong alternator?

Yes it was missing when I got the motor, that was a corvette alt and pulley i had laying around