The issue is compression, and this tractor can use all it can get. 11-12 hp is not much. The pistons will make more power. That said, the other issue is we can't tell how high the domes are. There are no valve clearance issues on a flat head engine design. So, the only way to check this is to put a piston on a rod and put it on the crank with the insert. (rings not needed). Place a thin layer of clay over the top of the piston (1/16" thick) then use the old head gasket, and a few head bolts in that cylinder to hold it down pretty well, no need to torque it. Then ---hand--- turn the engine through one revolution. and pull the head. If no marks, good to go. if marks are made, measure the thiscness of clay in the mark. If 1/32" or less, and in one spot, all the pistons need to be evenly machined to clear the 1/16" requirement (usually not much, but evenly to maintain exact wt.) If it rotates and stops hard against something, leave it there, do not force (even by hand) the engine through the TDC position. THis will tell the tale. Good luck, JimN
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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