Sounds like you've got an old cast-iron Model 9 or something close? Newer Briggs tend to have big bore and short stroke to allow higher RPMs. Your engine is "square" with equal bore and stroke and made to run slower.
Briggs model 9 is 2.25" bore by 2.25" stroke and has 8.95 cubic inch displacement. Runs a max of 3200 RPM. It was rated around 2.6 horsepower because it ran slow. Made a max torque of 5.3 pound-feet at 2700 RPM. Has a compression ratio of 5.3 to 1. An engine's horsepower output is pretty much determined by how many explosions it can make, i.e. RPM. Also how high a compression-ratio it can run. Double the RPMs and you can double the horsepower (up to a point).
A later Briggs engine, like the model 92500 is also 9 cubic inches but rated 3.5 horsepower at 3600 RPM. Has 2 9/16" bore by a short 1 3/4" stroke. Has the higher RPM, shorter stroke, and higher compression ratio of 6 to 1. Max torque is only 5.2 pound feet though . . . lower then the lower horsepower model 9.
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