What qualifies as a major overhaul? I have an engine that took a prop strike (previous owner).  The engine was completely disassembled to check the crank, case, etc for damage.  It was reassembled with new parts, bearings, rings, etc., overhauled cylinders, and mags with fresh 500 hour inspection. The logbook entry says "0 SMOH Lower End."  What else would be required to list this engine as simply "0 SMOH?"  How should I track this in my log book?
"0 SMOH Lower End." means just what it says. The lower end was completely rebuilt but there wasn't a complete overhaul of the "top end". Some of the old top end parts must have been re-used without being overhauled. 

I would suggest speaking to the person who did the overhaul to get more information on why the top end did not qualify for 0 SMOH as well.