Mr67Stang,
thanks. I also saw on another post that 1/4 inch in front to the lower wing. I need to go look at hot the rear cabane lines up with leafing edge of lower wing at the fuse side.

As far as the OS160 and Pitts muffler, the guy I picked up my Pitts from started with one in his and needed 12 oz of lead in the tail to get it to balance.