Briggs Vanguard EFI Engines Commercial-Grade Power The Briggs & Stratton® Vanguard® BIG BLOCK™ EFI engine found on select Scag® mower models is a proven performer with power and reliability. Features include: V-Twin OHV technology. Advanced debris management. Dual ball bearings. Dura-Bore cast-iron cylinder sleeve. Oxygen sensor—closed-loop system. High-pressure fuel-pump module. Electric-control module (ECU). Full-pressure lubrication with spin-on oil filter. Centrally located oil pump and pickup. Oil cooler. Heavy-duty cylinder and sump. High-efficiency head design. Lightweight piston and ring package. Dynamically balanced crankshaft. Five-inch, centrifugal, multi-stage air cleaner. Industrial-grade solenoid shift starter. Magnetron® electronic ignition. Engineered-resin blower housing, phase-modulated flywheel fan, and large-volume Super Lo-Tone muffler. * Note: Engine specifications based upon manufacturer-supplied information. All specifications subject to change at any time without notice or obligation. Engine specifications may vary by model.