Briggs Vanguards have always been beasts when it comes to power.
If I had to guess, a lot of that has to do with its power band. All to often, I see torque PEAKS on the 2000-2200 range on ZTR engines. Maybe Briggs realized that raising that torque peak about a thousand rpm would make the engine feel more powerful in its normal operating rpm of 3600-3750 rpm.
Now if they'd just efi them!
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