Sunnen HONALL is a miraculous invention. It hones these Rowe cast iron guides perfectly. It's honed hundreds of guides from the old Noots' Custom Cycles days . . . and it's still in use. They ain't cheap, but it's better than a reamer. Cast iron guides have better lubricity than steel guides.
The pilot fits in both ends . . . and the valve has proper fitment.
Now I'll hone the Exhaust Guides, cut the seats(you can see they're pitted) and we'll have a fresh set of heads, ready for another 30,000+ miles - (hopefully)with today's unleaded fuels.