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This is basically the set-up that I am running on my G now.. .125 over with the Flat head. But my head has had some serious work done to it. And it has been renforced. I do pull with 2 guys that have this same set-up and are running with the factory flat head, and they have not had any problems. (One guy has even cut some off the block too.) But you can NOT run pump gas, it will blow the head gasket and will knock. The pump gas will pre-ignite. You will have to run 108+ octane fuel. Like Burns said, you will have to shorten the push rods. For the Carb, there is two ways to fix the carb. There is a spacer that you can install between the carb and the intake, but they are hard to find, or you could have one made. Or you can just install the carb to the manifold and adjust the linkage. (This is what I did, because I had an extra linkage.) Also, if you are still running the factory air filter, the pipes will not line up, you can get a hose to go between them with the offset, but it doesn't look very good. You can cut the elbow down to give you move room to make the bend between the two pipes. If I was going to just use the tractor for pulling I would take the factory air cleaner off and run a dry type filter. (After you by fuel once you will know why it stops being used for anything else.) On my tractor I was still able to use the same exhaust pipe, but it doesn't fit very well, and I am going to have another one made. Just take you old exhaust pipe to a muffler shop and have them make you one, but have them make the bottom part 1in longer. They will have the bracket that matches up to the manifold. They will just fare out the end of the pipe, and install a 2 1/2in exhaust dounut. This makes a great seal between the manifold and the exhaust pipe.. I think they charge me about $20 for one.. And have them make it out of Alumnized pipe, and it won't rust and can be polished out. Let us know how you turn out.. Good luck..
JDGnut
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