[daveg]

A few more.

Pic 1 is 68 or [R] type. [valve]
Pic 2 is 69- or [S] type [no valve]
Pic 3 is marking on pump in pic 1. 10th day of 73 so a replacement??? It is NOS
Pic 4 is marking on pump in pic 2 157th day of 69


Pic 5 is 77th day of 69 and is [S] type but marked [U]???
Pic 6 is 105th day of 72 and is [S] type but marked [W]????

Have read posted info before but these odd, marked ones are not rare at all. That is why I have always thought the [1S] was 69- up Chev.

Always looking to learn.