This is the Briggs & Stratton Vanguard 28 HP 810cc Vertical Shaft Engine 49E877-0036-Z1.

Briggs & Stratton Engines are engineered to provide reliable and efficient power for a wide range of outdoor applications.

These engines are built with high-quality materials and advanced engineering to ensure long-lasting performance, dependability, and durability.

Features:

• Durability: The engine features a cast iron sleeved bore and increased cylinder block structure for added strength and durability. Users and experts comment on the robust build and longevity, contrasting them favorably with some other modern engines.
  
• Performance: The EFI system contributes to smooth performance and easy starting. Reviewers mention the engine "runs great" and "performs well" in demanding applications.
  
• Maintenance: The cyclonic air filter is praised for extending maintenance intervals, lasting longer than standard filters. An available "Oil Guard" system option (on some Vanguard models) can extend oil change intervals to 500 hours, significantly reducing downtime and maintenance costs.

Product Specifications:

• Engine Series: Briggs & Stratton Vanguard Series
  
• Power Output: 28 Gross HP
  
• Engine Displacement: 810 cc
  
• Engine Orientation: Vertical Shaft
  
• Number of Cylinders: Twin cylinder (V-twin)
  
• Fuel System: Electronic Fuel Injection (EFI), float feed carbureted (general type for the series)
  
• Cooling System: Forced Air Cooling
  
• Lubrication System: Full pressure lubrication with spin-on oil filter and oil cooler
  
• Air Filter: Cyclonic air filter for enhanced debris protection
  
• Starting System: Electric Start
  
• Alternator: 20 Amp
  
• Shaft Size: 1-1/8" Diameter x 4-5/16" Length
  
• Oil Type: Synthetic 5W-30 or 10W-30
  
• Warranty: 3-Year limited commercial engine warranty