ORIGINAL: 1QwkSport2.5r

I'll have to double check, but I'm pretty sure the piston can go into the liner only one way because of the backplate recess cut in the piston. If you made a relief on the other side of the piston it can be done. The Teflon pad in the piston would ride on the port divider on either side of the liner though.

Ill check my .65 when I get off work.

You cannot run a sportster as "rear exhaust" because the wristpin is retained with a Teflon pad that rides on a port divider in the transfer port on the rear (I believe it's the rear). The Teflon pad would get caught in the exhaust port.