[marcrose]

Commonly known as an 811 casting.Bought one at napa a few years ago.They had a listing for the proper part numbered pump.

 

[Robinls5]

I have two that are in the old " ATLAS " box = ESSO gas stations when they worked on cars. New in boxes 811-TX do not know the dates, Just havem for spares ,, I will look at the dates on the pumps.

 

[68elky396]

Get in touch with Ron Burke @ Chevy Cool, chevycool.com 480-720-8000. I bought a correct rebuilt date coded water pump from him for my '68 about six years ago and it is still working great. Great guy to do business with.