When it comes to maintaining peak performance in your Mercury or Mariner 2-stroke V6 outboard engine, choosing the right gasket is critical—especially the AFM Powerhead Base Plate Gasket made from Victor Reinz AFM 30 material.
 
This premium gasket material is specifically engineered to deliver a superior seal between the powerhead and midsection, stopping cooling water from leaking into the exhaust, which can rob your engine of vital horsepower and reduce efficiency.
 
Designed for high-performance 2.0L, 2.4L, and 2.5L Mercury/Mariner V6 engines, this gasket is a direct fit for a wide range of models from 1980 through 2005. Whether you're working on a 135, 150, 175, 200, or 225 Pro Max, or even tuning the legendary 260 ROS, 280, or 300 Drag, this gasket ensures maximum sealing under extreme conditions.
 
This high-performance gasket is precision-cut to match OEM tolerances and is ideally suited for high-output engines like the Mercury XR6 150, 200 EFI, 225 Pro Max, and 260 ROS (Race Offshore Series). Whether you're rebuilding a vintage 1980s 2.0L V6 or refreshing a 2005 2.5L 300 Drag, this AFM 30 base plate gasket delivers a factory-grade seal built for sustained high RPMs and intense thermal cycles.
 
The gasket is cross-compatible with a wide range of OEM and aftermarket part numbers, including: 18-0378, 31530, 37620, 78069, 823142, 8231421, 8231422, and 9-60045. Each of these part numbers is associated with Mercury's most powerful and race-ready 2-stroke engines, including the 2.5L 260 ROS, 2.5L 280, and the 300 Drag.
 
Boaters running models like the Mercury XR6 or Pro Max 225 will notice the AFM 30 gasket’s enhanced resistance to warping, even under long-term, full-throttle conditions. The AFM (Aluminum Faced Material) construction by Victor Reinz adds superior sealing capabilities and longevity compared to standard paper or fiber-based gaskets, making it the go-to choice for marine mechanics and offshore racers alike.
 
If you're rebuilding or upgrading a Mariner 150 Magnum EFI, Mercury 2.4L Bridgeport, or any other high-performance outboard in the V6 range, the AFM 30 Powerhead Base Plate Gasket—available under part numbers like 823142, 8231421, and 18-0378—is essential for preventing exhaust leaks and protecting engine integrity during wide-open throttle operation.
 
In conclusion, the Mercury / Mariner 2.0L, 2.4L, and 2.5L V6 High Performance Powerhead Base Plate Gasket, manufactured using Victor Reinz AFM 30, offers superior sealing for some of the most powerful marine engines ever built.
 
With compatibility across top-tier models such as the 135 V6, 150 XR6, 175 EFI, 225 Pro Max, 260 ROS, 280, and 300 Drag, and trusted part numbers like 18-0378, 31530, 823142, and 9-60045, this gasket is the proven solution to keep your outboard running strong on the water.
 
Includes one (1) Powerhead Base Plate Gasket, each V6 requires two (2) if running the Race Cowl with plate.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.