Some time ago, there was an interesting discussion about the 3829387 alternator pulley used for 65 and later big blocks. The discussion focused on the part number and code that may or may not have been stamped on the face of the pulley. At first, the discussion seemed to indicate that all of these pulleys were stamped. Eventually, it was decided that the number was stamped starting some time in early 1965.
A few claimed that no number would have been on this part until some time into the 66 model year. Others strongly disagreed.
A VERY interesting article in the new Restorer magazine by Herb Larsen may show that, indeed, NO early/mid production 65's and most likely no early 66 cars had a stamped pulley.
Included in the article is the GM print for the 3829387 pulley. In the revision list, it shows that the stamp was ADDED to the print on 19 May 1965. (doesn't mean they started stamping pulleys on 19 May 65)
That means all pulleys made prior to that date were unstamped. It also means that it may be SEVERAL months before stamped pulleys actually made their way out of their source and into bins on the assembly line.
It's unlikely that any 65 car would have left the plant with a stamped pulley. It's also possible that early 66 cars may have had unstamped pulleys also.
I always wondered about this because my Nov 65 built 66 has what I always thought was the original unstamped pulley. I've seen many other examples of unrestored mid/late 1965 CY cars/alternators over the decades too that do not have the stamp.
A few claimed that no number would have been on this part until some time into the 66 model year. Others strongly disagreed.
A VERY interesting article in the new Restorer magazine by Herb Larsen may show that, indeed, NO early/mid production 65's and most likely no early 66 cars had a stamped pulley.
Included in the article is the GM print for the 3829387 pulley. In the revision list, it shows that the stamp was ADDED to the print on 19 May 1965. (doesn't mean they started stamping pulleys on 19 May 65)
That means all pulleys made prior to that date were unstamped. It also means that it may be SEVERAL months before stamped pulleys actually made their way out of their source and into bins on the assembly line.
It's unlikely that any 65 car would have left the plant with a stamped pulley. It's also possible that early 66 cars may have had unstamped pulleys also.
I always wondered about this because my Nov 65 built 66 has what I always thought was the original unstamped pulley. I've seen many other examples of unrestored mid/late 1965 CY cars/alternators over the decades too that do not have the stamp.
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