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just bought a murray push mower with a 450 briggs last week for 150 at walmart
they had a few murray mowers 1 had a 300 series briggs and the other had a 450 series briggs both look identical and had the same specs listed whats the difference between a 300 and 450 series briggs motor?

The 300 has 3.00 ft/lb of torque, the 450 has 4.50 ft/lb of torque. More torque more work it can do without overloading the engine