Briggs and Stratton 305447-3077-G1 479cc 16.0 Gross HP Vanguard Engine with a Threaded 1-14 1-Inch Thread Length 2-29/32-Inch Length Crankshaft Dura-Bore cast iron cylinder sleeve for extended life Float carburetor for consistent easy starting 12 Volt electric start Dual-Clean air cleaner pleated paper filter with a foam pre-cleaner ensures maximum protection for extended engine life Overhead valve design for cooler operation and longer valve life