While I am waiting for the pilots I started to rebuild the lower end. This motor had ingested dirt over the years and while it ran good it started using a lot of oil. I did a leakdown test and one cylinder was at 10% leakage the other 50% but it was leaking out the exhaust. The motor without the heads turned over effortlessy. After disassembly I saw something I had never seen in all my years, a step near TDC on 180 degrees of the bore. It did not get touched till I honed cylinder .010 so it was worn about that depth This was a step of wear not tapered. Firsttwo pics are the step second pic is after honing .006 out step is still there but smaller. Rest of pictures are of reassembly. I went .020 over as that was only size I could find. I honed to the tight side of the spec, .3.139 and the top ring gap was only .006. I thought that was a bit tight for a air cooled engine so I filed them to .010. I also coated skirts with Dow Molykote. Today I will install the sump using the new bolt kit and gasket will says to torque bolts to 300 Inch lbs. Hope I do not strip any holes.