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Briggs & Stratton 23 HP Vanguard V-Twin OHV Horizontal Engine. V-Twin 90° overhead valve design runs cooler, cleaner and more efficiently. More HP output with less displacement and less carbon build-up. Longer valve life and improved fuel economy. Full lubrication with spin-on oil filter cleans oil and protects engine components to ensure maximum lubrication and long life. U.S.A.