It's really only an approximation or perhaps a rough measurement at least for the Briggs. There's really no direct conversion since you have other factors determining final hp out. For example you could have the same engine ci and put a turbo on it or increase the compression, both of which will change the amount of power out. The Cubic Inch measurement is only how much volume of liquid or air the cylinder will hold in the gap between top dead center and bottom dead center of the piston's travel.
Edit, this probably explains it better with math and an animation image:
19000 series B&S engines were generally rated for 8.0 or 8.25 hp depending on the flywheel used and application. They are decent engines. The older non-magnetron ones are a real pain in the you know what. The coils would always go bad, mimicking poor carburetor adjustments. The proper magnetron replacement coil is a B&S part number 398811. They are about $35 a piece. If you plan on running one of these engines, they are a NECESSITY
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