MerCruiser 8.2 520 Mag EFI

The new MerCruiser 8.2 520 produces more torque than its 525 EFI sibling and shares the same CNC-machined cylinder block used on its Mag HO cousin and Mercury Racing 525 EFI. To make the rated horsepower and additional torque for the 520, Mercury Racing increased the cylinder bore size for an additional 21 cubic inches. Total displacement for the 520 engine is 523 cubic inches (8.6 litres).

​

The larger displacement, combined with Mercury Racing cylinder heads, multiport fuel injection and an electronic throttle body results in nearly 100 additional horsepower over the 430-hp MAG HO. The engine runs on 87-octane fuel and meets Environmental Protection Agency and California Air Resources Board emissions standards.