Flat head is a reference to the design of the engine in your tractor also referred to as a F-head. It is common of many early 1900s engines. The valves are in the cylinder block, beside the cylinder. The next more common design is the L-head or overhead valve design, as the name states the valves are over the top of the cylinders. I have attached a link that described those different designs plus an overhead camshaft design. On the flat head design to access the valve lifters and the adjustments the intake and exhaust manifold need the be removed then there is a cover to remove to get to them. The only other way to see the valves without removing the cylinder head is through the spark plug holes and then you only see the edges of them.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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