Did GM put date codes on old water pumps and where.. Lotsa "Bubba" rattle can paint on the
2608 unit but I can make out a 6 with an "M" in a square.
On the other pump, I see a "GM 3" on the front, and when I turn it over "S3" is stamped on the rear.. The 2609 pump has a fitting somewhat like a BBC on the middle of the pump and the 2608 pump has a fitting 45 degree angled to the psgr. side...
Any idea of the dates of these beasts and, what is best way to clean these e.g. media blast without marring the pumps... Thanks!! T.