1969 bb water pump #3931065
 

I am asking for help to determine if this water pump pully is correct and also what the A 1 is for the the outlet and also is the bolts for the back cover correct. Any help would be appreciated.
Tony

Hi, you mean the hub? That looks like an original hub to me; the rebuilders typically, if they change the hub, install a dual pattern one with both large and small bolt patterns.

That is an original type of head marking I've seen on bolts, if they're all the same, that would lend credence to guessing that they're original; are there captured star (lock) washers on them? Originals usually were, in my experience.

The A1 is likely just a casting / check number. I've seen it before. I have an 811 pump here with just an "A" there.

Cheers,
Anthony