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Good Ol Boy, My wife fliped our H over about a year ago (she wasn't hurt either thank goodness) and it did a lot of damage. Most damage was superficial - steering shafts were bent, steering post was destroyed as was the seat, gas tank, hood, radiator, and grill. I just repaired or replaced these parts. My tractor also kept running for a minute or so after the accident and that lead to a few potential problems as well. Dirt and sand got into the manifold through the exhaust pipe when I fliped it rite-side-up. So I pulled the manifold off and blew as much of the dirt as I could out using compressed air. I was afraid that some sand probably got into the head as well and so pushed a little air through the exhaust and intake ports while I had the manifold off. I'm glad I did because some dirt along with some carbon did blow out. I also, carefully blew air into the cylinders through the spark plug holes. I don't know if this was a good idea or not, but I figured that it couldn't be generating forces in the cylinder any greater than exploding fule would. The carburator may have had dirt in it as well but I couldn't tell because it was full of oil from the air breather. The oil was probably worse than the dirt. I was afraid it would gunk up the jets and passages, so I took the carb apart and soaked the body in cleaner for a day. In addition the oil apparently affected the rubber tip on the plunger (probably the wrong word) that is controlled by the float and lets gas into the bowl. The darn thing started sticking closed and I had to get back into the carb and replace it. On the advice of others from this board, I opened the transmission and checked it out too. Apparently it is possible to have bits of metal or ball bearings, etc., come loose and find their way between the large drive gears and crack the casting. Fortunately, I didn't find anything like that, but it gave me the chance to clean the accumulated muck and grit out. I also took the opportunity to replace the worn poppet balls and springs as well as the main gasket. I must have done OK, because I started it yesterday for the first time since the accident and didn't find any (new) problems. I'm not sure how much of this may apply in your case since I have no idea what a 450 looks like on the inside, but I hope I was some help. Good luck.
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