there is a nice M in the photo ads it says rebuilt engine with 34 hp on the drawbar and 39 on the belt pulley now i thought a M was a 40 to 45 hp tractor? i have a ford jubilee in great shape and its advertized as being 31 hp, i grew up with grandpa's '49 M, and i can tell you that M would pull that ford inside out, then make change with it too , as far as i know grandpas M was completely stock they did overhaul the engine a time or 2 in the 30 years it was a working tractor but knowing my grandpa he wouldn't have gone for any "hot rod nonsense" so im pretty sure it wa put back stock each time