My Carl Goldberg Anniversary Cub, with an OS 48 Surpass. I bought this in a "lot" of old airplanes. The engine was frozen up solid, airframe was beaten up pretty good and just a little bit crooked.
I restored it to flying condition, patched up the covering, got the engine running and rebuilt it (new bearings, cleaned the gunk out of the cylinder head, etc). It has over 200 flights on it now!
There's just something addicting about a Cub.