I tried dressing up a very well used 2.055 Ferrea valve out of an old set of Edelbrock heads my son ran years ago. I bought the recommended white stone and am now grinding with type F transmission fluid and I’m more than happy with the results.
Great machine, does it have the replacement collet/spacer assy., or the original one? I bought the replacement in case, Mine is still OK. I haven't used the white wheel, but it's on the list while I'm doing some service & repair, the brush holders use a choke-spring style wire connection....one of them let loose so..