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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