This is a friend's "new" WD that I just got a good look a yesterday. I understand that late WD's built after #127008 came with the 45 transmission (curved shifter) but what about the motor? This has the 4" head indicating a "45" overbuild in a WD block...was this stock from the factory? The tractor is in good origional condition and the previous owner did'nt think it was ever re-built as it was never used much. For all intents and purposes a WD45?