here are a couple of my recently purchased american made tools- first a Van Dorn valve refacer - found it on craigslist
not sure on the vintage but after i found a manual there are references to refacing model A and T valves..:laughing:
It runs good and the max run out on the work head is less than .001 using drill stock and a dial indicator and as good on the stone head.
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And here is the complimentary Black and Decker seat grinder i purchased off of e bay-
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had to find a new ball bearing stone holder and a new pilot for the stone truing stand to keep run out to a minimum.
Have already finished one of my Pontiac 455 heads (3 angle) and ground the valves including back cutting.
This is all practice to repair the ( Professional) valve job i paid to have done on my Rhino 554 head...