ATAT Performance and Buckshot Racing #77 proudly offer a precision-engineered Billet Bottom End Cap, designed as a high-performance upgrade for a wide range of Mercury outboards.
 
This bottom cap is expertly machined from aerospace-grade 6061 CNC Billet Aluminum, offering superior strength, longevity, and alignment compared to OEM cast components.
 
It is a direct replacement for Mercury OEM part number 8120A1, commonly found on the SST-120, S2000, and S3000 race engines, and features counter-sunk front bolt holes to accommodate a 12" mid-section tuner plate, ensuring clean installation without interference.
 
In addition to race engines, this billet bottom cap replaces OEM part 7809T1, found across nearly all Mercury 2.0L, 2.4L, and 2.5L V6 outboards, making it a versatile upgrade for many powerheads. 
 
This includes motors from the early XR2, XR4, XR6, Black Max, Mariner Magnums, and 200 HP carbureted models, all the way to fuel-injected units like the Mercury XRi, EFI 175/200, 260 EFI, and 280 ROS.
 
It also supports high-performance builds of 2.5 Drag, S3000, Pro Max 225 HP, and other racing or performance-modified Mercury outboards.
 
This bottom-end cap is CNC-machined to tight tolerances to ensure optimal crankshaft support and alignment. The billet aluminum construction eliminates the flex and wear issues seen in aging cast factory caps, making it ideal for performance builds, rebuilds, or restorations. 
 
Whether you're building a competition-ready Mercury 2.5 Drag motor, restoring a classic XR6, or upgrading a 260 or 280 EFI, this billet bottom-end cap by ATAT Performance and Buckshot Racing #77 delivers reliability and precision.
 
It is 100% made in Australia and engineered by racers who understand the demands of high-RPM two-stroke performance. Replaces the Mercury Cast OEM Bottom End Cap, part numbers 8120-A1 and 7809-T1. 
 
This billet top cap is available now through ATAT Performance in Australia and Buckshot Racing #77 in the USA—two trusted names in Mercury 2.5 high-performance parts and racing innovation.
 
For serious performance and a fit that exceeds OEM standards, upgrade to the ATAT billet bottom end cap—the ultimate choice for Mercury outboard enthusiasts and racers.
 
The initial run of bottom caps are offered at the RacerNet special of $159!
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.