The Mercury Racing Horn Intake Gasket (993163) is a premium AFM intake gasket designed for Mercury Racing 2.4-liter and 2.5-liter EFI outboards.
Manufactured from modern AFM (Advanced Fiber Material) gasket material, it provides a superior seal between the EFI horn and intake plenum while resisting fuel, oil, vibration, and the elevated temperatures commonly encountered in high-performance two-stroke applications.
Unlike traditional paper gaskets that can shrink, compress, or deteriorate over time, AFM material maintains its sealing properties under demanding racing conditions. The result is improved reliability, reduced risk of vacuum leaks, and more consistent engine performance.
Why Intake Horn Sealing Matters
The EFI horn is a critical component of Mercury Racing's intake system. Any air leak between the horn and intake assembly can affect airflow measurements, idle quality, throttle response, fuel delivery, and overall engine performance.
A properly sealed intake system helps maintain consistent airflow into the engine while supporting the precise fuel and air calibration required by Mercury Racing's high-output EFI powerheads. Replacing the horn gasket during intake service, EFI maintenance, or engine rebuilding is inexpensive insurance against vacuum leaks and tuning issues.
Built for Mercury Racing EFI Engines
This gasket is designed specifically for Mercury Racing EFI engines utilizing the factory intake horn assembly. Popular applications include the legendary 2.4 Bridgeport EFI, 260 EFI, 280 ROS, 300 Drag, S3000, Formula 1, and various Offshore EFI powerheads.
These engines routinely operate at elevated RPM levels where maintaining a stable intake seal becomes increasingly important. The AFM material is well suited for these demanding environments and provides a durable alternative to traditional gasket materials.
Precision Fit and Direct Replacement
Manufactured to meet or exceed the fitment requirements of Mercury part number 993163, this gasket installs as a direct replacement without modification. Precision-cut AFM material ensures proper alignment and sealing across the intake mounting surface.
Replacing a damaged, compressed, or aging intake gasket helps maintain proper engine calibration while reducing the potential for lean-running conditions caused by unwanted air intrusion.
Cross Reference Part Numbers
This gasket replaces Mercury and aftermarket part numbers: 993163, 993162, 993161, 99316, 10-2703, 510-46.
Installation Recommendations
For best results, thoroughly clean both mating surfaces before installation and inspect the intake horn and plenum surfaces for damage or distortion. Follow Mercury Racing torque specifications during assembly and verify that all mounting hardware is properly tightened to ensure a consistent seal.
Final Thoughts from Buckshot Racing #77
The Mercury Racing AFM Horn Intake Gasket 993163 is a simple but important component in maintaining the performance and reliability of Mercury Racing EFI outboards. Designed for the 2.4L Bridgeport EFI, 260 EFI, 280 ROS, 300 Drag, S3000, Formula 1, and Offshore EFI engines, this premium AFM gasket provides superior sealing, improved durability, and long-term reliability for some of Mercury Racing's most legendary two-stroke powerheads.
For further information or to discuss the best option for your engine, contact Mike at +1-714-697-1716 or email mike@buckshotracing77.com