rimflo valves

[code5 <code5@ibm.net>]

Hello again--
Anybody got an opinion on the subject of rimflo valves?
I'm putting an early 1800cc head on a 1622 engine, smoothing the ports a
little, adding the Moss HP cam, lightenning the flywheel. I'll get
K&N's.
The rimflos are quite a bit more expensive than stock.
Burgess's book describes modifying stock valves the same way--taking
material from the neck to improve flow.
Not sure whether or not there'll be adequate payoff on a road engine.
Thanks in advance for any thoughts.
John Vallely