http://www.lycoming.textron.com/cgi-...k+in+procedure

A new nitride cylinder will break in fast. Keep your power high, don't baby
it. Straight mineral oil.

Jim

"Robert M. Gary" wrote in message
oups.com...
I just replaced a cylnider in my IO-360 with a new cylinder kit from
Lycoming. Where can I find the service instructions on how to
correctly break the cylinder in?