In the bolens product sheet that Columbia236 posted today, they list the HB as being made through 39. I knew the PB was ended in 35 and went over to the asecc site and checkd the serial lists. Production of the PB fell off after Feb 30. From Feb 30 to Feb 32 there were about 1000 units produced. Between 32 to Feb 35, the last listing, there were only about 100. Makes you wonder if the last 3 years wasn't stricty filling Bolens orders? Would bolens have had enough engines on hand to build the tractors through 39? Would they have had that many left over to offer them through 39? Would the dates be wrong? I don't imagine this tractor was a real big seller. I'm just throwing this out as another question that will probably never be answered but could be a part in the puzzle.
Link to the file http://gardentractor...specifications/