Your 655 is more than welcome here, after all its basically a P62.That's a nice looking saw. The piston and rings are still available new. They run about $75 for the piston/w rings.
Not exactly cheap, but a small price to pay to get a saw like that in top shape again.
Is that for a boost port piston? There differnt are they not between the 62 and the 655?
I don't know just asking.
All I know is from the looks of Jasons saw, that $75 is well worth making it live again after running the one Chris had the other day.