BSA C15 Valves

[TTJOHN]

Has anyone ever tried using different valves in a C15? reason I ask, I have ordered some new valves from a dealer but then in the back of my mind, I thought I have a load of new valves in the shed, so I had a quick look to try a comparison and found that a Toyota valve almost the same size, just the stem is 15 thou thicker, so in theory I could just ream out the old guide to the correct size for the stem, I would have to use the colletts for these valves and what are the differences in the valves grade of  metal wise inlet and outlet.
What does the team think?

TTJohn
Modify message Sorry I believe I may have posted this in the wrong place