I forget the shop name, went there with my uncle who's been into racing for a long time and has good connections. Knowing him, if he trusts it, I trust it. According to the shop, lapping valves is what everyone is taught in mechanics school to be the only way of doing it, but isn't the right way to do it.

That's what they said. If you can't pass the seat test that they do, it's got to go for machining.

It makes sense to me, if a valve is making a good seat all around doing their method of testing, why would one lap it anyway.