Inliners International Forums General Discussion Engines Hardened Valve Seat Inserts and unleaded fuel . . .

I would just install the seats $110-120 US dollars & be done w/it.
And yes ,BTW, that is what it will cost you to have six seats installed.
Hardened seats definately work also.
With hardened seats, the valves will get beat up/erroded before the seats will.

MBHD