As the 2013 season winds down, I wanted to drop you a note of thanks and mention how satisfied my riding buddy Mike and I are with the 670 dual ring piston rebuild we implemented on our 500ss engines along with your billet heads.
Our 500ss engines have never sounded or performed better ...it was a little extra work, shimming the cyls/deck height, but at this point I'm very pleased with the results. We started slow, way on the fat side ... our mpg is currently what I would call safe @ 13-14ish, but now near the end of the snow season in Maine, both sleds run awesome!