Rebuilding a Riley 4 Port head that uses 1/8 inch oversized Model A Ford valves. The valves I have are two different manufactures. One is Jadson 1058 and the other is Thompson S801. I can find no info on either. These are mushroom stem valves with a head size of 1 and 5/8, stem is 5/16 and length is 5.75. Not interested in modern valves at this time. If any one has other manufactures and part numbers it would be a big help with Hershey coming up in a few weeks.