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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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