If I remember, you're non-turbo'd, right? Fly below 6000ft density alt and
you should be able to develop 65-75% power at full throttle, high RPMs, and
a nearly full rich mixture. This should seat the rings just fine. It's the
pressure in the cylinder forcing the rings outward that seats them. Keep
the head cool so your new valve seats don't wander.
Jim

"Robert M. Gary" wrote in message
oups.com...
On Aug 31, 2:49 pm, "Dan Luke" wrote:
"Jim Burns" wrote:
A new nitride cylinder will break in fast. Keep your power high, don't
baby
it.

Right.

And keep it cool so it won't glaze. Full rich or close to it, cowl
flaps wide
open.

Actually my concern is not getting it hot. My engine CHT's run about
290-300F in the winter and 360-380 in the summer in cruise. I'm afraid
that won't be enough to get a good seating.