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Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

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For anyone wanting ,,MORE POWER,,,

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I have a nice 16 hp Briggs horiz. twin mod 401,000 ser that bolts right into a 7100 Sim or a 900AC This eng. will NOT fit the older tracs without SEVERLY notching out the frame rails.It's a complete eng including twin mufflers. we 'load tested'it on a Sim. with a 42" thrower and it ran that effortlessly in the 20" snow we recently had.

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