That's the same tractor my dad had when I was growing up. 1963 Wheel Horse 633 with a 7hp Kohler motor. That tractor went 23years before the rod came through the side of the block, I was mowing his yard when it happened, hot oil all over my right leg! And he got it fixed, someone he knew at the Buick foundry took all the pieces and brazed it back together. It ran another 6 years before he sold it to a friend of mine, and it is still mowing grass on a regular basis (not at the moment since there is snow on the ground, but you know what I mean). They just don't build them like that anymore, so sad.