This page details some of the examples on NOS genuine Ford intake and exhaust valves, as well as similar era replacements.
Model A and B valves are interchangeable, and the original A-6505-A part number was changed to B-6505 with the introduction of the Model B Ford in 1932. There was no distinction between intake or exhaust valves.
The pics above and below shows a comparison of two styles of NOS Model A valves on the left, and the comparable unmarked era replacements made by Rich on the right.
The table below details the magnetic properties of various valves and their components.
| Part Number | Style Description | Head | Stem |
|---|---|---|---|
| Ford A-6505-A B-6505 |
Smooth stainless head Stamped Ford script marked "R" |
Slightly magnetic | Some magnetic Some non-magnetic |
| Rich V600L |
Smooth stainless head Unmarked head, number on stem |
Slightly magnetic | Magnetic |
| Ford A-6505-A B-6505 |
Indented dish head Forged Ford script marked "R" |
Magnetic | Slightly magnetic |
| Rich 600 |
Indented dish head Unmarked head, number on stem |
Magnetic | Slightly magnetic |