The Buckshot Racing #77 Pro Piston Kit is a premium replacement for Mercury OEM piston assemblies 822066A3, 822066A5, 822066A7, 822066T7, 858294T1, and 858294T14. Designed for the 3.625-inch (3-5/8") bore Mercury 3.0L V6, these piston kits fit a wide range of Mercury Marine and Mariner outboards manufactured from 1994 through 2008.
Whether you're rebuilding a 200 HP, 225 HP, 250 HP, or 300 HP powerhead, replacing worn pistons with correctly machined components is critical for restoring compression, maintaining proper ring seal, and ensuring long-term engine reliability.
These piston kits are ideal for complete engine rebuilds, cylinder repairs, or restoring high-hour engines back to factory performance.
Fits Mercury EFI, DFI Optimax, SeaPro & Saltwater Models
The Mercury 822066A7 and 858294T14 piston assemblies were used across numerous 3.0L Mercury V6 platforms. These replacement piston kits fit many 200 HP EFI, 225 HP EFI, 250 HP EFI, 300 HP EFI, 200 Optimax, 225 Optimax, 250 Optimax, 300 Optimax, Pro XS, SeaPro, Saltwater Series, Offshore, 250XS, and 300XS engines equipped with the 3.625-inch bore block.
Because Mercury revised piston designs throughout production, the engine serial number should always be verified before ordering. These kits replace several Mercury superseded part numbers, making them an excellent service replacement for many 3.0L applications built between 1994 and 2008.
Complete Piston Assembly
Each piston kit includes a precision-machined piston, piston ring set, wrist pin, wrist pin bearing, and new retaining circlips. Installing all new components during a rebuild helps maintain proper piston alignment, dependable lubrication, and consistent cylinder sealing while eliminating the risks associated with reusing worn internal hardware.
Manufactured for Mercury's 3.625-Inch Bore Platform
Mercury's 3.625-inch bore 3.0L V6 has become one of the company's most successful large-displacement two-stroke platforms. Found in everything from recreational fishing boats to commercial workboats and high-performance bass boats, these engines are known for exceptional torque and durability.
The Buckshot Racing #77 Pro Piston Kits are manufactured to precise tolerances for consistent piston weight, accurate ring groove dimensions, and proper wrist pin fit, making them suitable for both stock rebuilds and performance applications.
Final Thoughts
The Buckshot Racing #77 Mercury 3.0L Pro Piston Kit replaces Mercury OEM 822066A3, 822066A5, 822066A7, 822066T7, 858294T1, and 858294T14 for numerous Mercury Marine and Mariner 3.0L V6 engines.
Designed for the 3.625-inch bore platform, these piston kits fit many 200 HP, 225 HP, 250 HP, and 300 HP carbureted, EFI, and Optimax DFI outboards, including SeaPro, Saltwater Series, Offshore, Pro XS, 250XS, and 300XS models built from 1994 through 2008.
Whether rebuilding a commercial work engine or a tournament fishing motor, these premium piston kits provide the precision, reliability, and durability required for a professional-quality powerhead rebuild.
Contact Mike Hill with any questions at 714-697-1716 or mike@buckshotracing77.com