Flat heads seemed to have more valve issues. My experience with flat head lawn mower engines were valve guide wear and valve seat recession. Only way to adjust valves on flat heads was to remove valve from engine and grind valve stem. Lot of trial and error to get valves adjusted right.
The valve grinders even had provisions to grind of valve stem.
Today's OVH lawn mower engines seem to have higher compression and require a compression release built into cam. OVH mowers require valve adjustments. So there still may be valve seat recession, but you can easily fix the problem, just adjust the valves.
As for Hp, torque, and compression it really hard to compare apples to oranges. Today's engines are diesel, so yes more compression.
Brother had a 1937 JD D. Two cylinder, long stroke, overhead valves, Very slow RPM's, lots of Hp, lots of torque from the long stroke.
I stay away from flat heads. One reason I bought a Jubilee instead of the N's.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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