Any one try that? I had a Meteor 52mm piston for a Stihl 064 and a aftermarket 272 top end.... stuck them on a Jonsered 670 after converting the carb over to pulsing through the manifold. It starts and idles.... have it noload at 13k. Haven't tried to cut anything yet. Any one ever do that and actually have a gain?? The Stihl piston is a bit taller, with no base gasket the squish was .022 on that AM cylinder. The skirt is shorter as well. Maybe to short and might mess up the intake timing to the point of issues. Don't know. Didn't put a degree wheel on it either yet. This was just trying to get a running saw out of a pile of random left overs from other projects because I was bored....