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Briggs and Straton 14hp engine

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If memory serves, some time in the 70s Briggs and Stratton changed there biggest single cylinder engine from a 12 hp to a 14 hp. Can anyone tell me what the difference is between these engines. I have a 14hp and it looks just like the 12hp engines. I know the only difference in a 3 and 3.5 Briggs engine is the carburetor. Didn't they also make the 10hp an 11hp? All theories or factual answers welcome. Tim

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Tim, The 12 hp model 300,000 series engine is 30 cu in. bore is: 3.4375. The 14 hp model 320,000 series engine is 32 cu in. and has a bore size of 3.5625. The difference is minimal, 2 cu in. and on the outside they look identical. Hope this helps Regards, dlc

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