RE: Dang it, I hate working this hard! There appear to
>I realize now you are making an assumption. Just because a
>car used a part or a part was designed for a specific car
>does not mean that was all it was used for.
OK....Thanks for researching that out. I do not have the early MPC's to go as far as you can. A member here called a vendor and it was stated the B7A was used only on the F-CODE 57 (even though catalog listing included 1958). I had no idea a valve as such was used. I assumed it had to be an inline to work with the tubing on the two-stage pump. I was wrong. The 58 valve may be able to be used for later applications also. Did text give you thread sizes?
>Yes, the valve
>has a 57 part number but that does not stop it from being
>used on a 58 on a different engine size or for a different
>purpose. The best example of this that I can give would be
>B7A-12106-A distributor caps that were used until about 1976
I worked parts in dealerships for I don't know how many years. I am fully aware of how the system works.
Service replacement for B7A 12106-A was D5AZ 12106-A. I can remember that one off the top of my head.