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That's a flathead, if I remember right. You will need a valve guide driver. I bought mine in a set of 4, but you may be able to buy the size for your tractor. Put shop towels or something similar in the oil drain holes that let oil drain back into the crankcase. Remove the valves. Take a measurement with a depth guage, even one of the plastic kind from the top of the block to the top of the valve guide. If you leave the teppets in, then use the valve guide driver and drive the old guide down. If the tappet is in the way, take a hammer and punch and break the old guide off, and finish driving the guide out. Do this for all 8 guides. This is a good time to clean the ports with a wire brush and whatever. Oil the outside of the new guides, and using the guide driver and depth guage, drive the new guides into place, making sure to get the correct side down, if there is any difference. You should then run a reamer down the guide to remove any burrs from driving the guides. Be sure to drive the guides straight, and don't break them.
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