Since my other post about this I buried elsewhere, who can tell me what this pump is for and what the casting numbers mean.
Also, not drilled for the by pass.
I discovered it while digging through a few pumps I have looking for one for the 61 409.
Pat, keep in mind that the casting number on most castings is the part number of the un-machined casting. Once it is machined, with or without the bypass or parts added it gets a different part number.