.boB

iTrader: (1)

I learned to do it about 30-40 years ago. I was taught that it required a back and forth motion, with a gradual advancement. Why? TBH, I really have no idea! I'v been using this too for decades, and I really don't know why.



Is it better than a drill? No, I don't think so. Your way with a drill works just as well and is a lot faster.

I asked a pro builder one day if it was worth hand lapping valves. He told me it probably wasn't worth the effort for most new engines. But I do it anyway. If you get a nice even honing band on valve face and seat, you get visual confirmation that they're square to each other.

wph351

iTrader: (3)

Thanks for posting this. Atv and dirt bike guys do this on refreshes. This is the first I've seen somebody do it on a car valve. Any tips on keeping the valve square to the seat? Or is it just "feel"?

01ssreda4

iTrader: (96)

If the guide isnt worn it runs perfectly centered.

wph351

iTrader: (3)

Yes true.