Marine Performance Parts

Need A Tune?

We don't provide computer tuning, but we have fulfilled countless good people who do. Discover our tuner listing to find a tuner in your town.

496MAG Stage 1 MAKES 550+HP

Full Throttle Marine dyno tests a series of header options on a 496MAG HO. After setting up our 525HO / 496cid Stage 1 marine kit they made 553 horsepower @ 5400RPM!

Cool Gap Intake Manifold

The stock intake manifold can’t meet up with the ventilation needs of Mercruiser engine in overall performance programs. Our Cool space intake manifold has been engineered for starters function, optimum airflow and power production in marine applications. Our intake manifold includes long, high-velocity runners to present exemplary low and mid-range torque levels and a big plenum amount to fulfill the need for even more atmosphere at greater RPM’s. Our design keeps the incoming air gas mixtures cool and heavy, creating more power and torque within the entire power band.

• 4 Readily Available Throttle System Openings
• 78MM (3 bolt / LS1 style)
• 80MM (Ported 3 bolt / LS1 style)
• 90MM (4 bolt / LS2 style)
• Unlimited Edition (Dual 1000CFM Carb-Plate EFI)

Simply How Much Air Do Raylar Heads Flow?

Raylar Big Power cylinder heads out circulation every 496 / 8.1L cylinder at once the market. Our combustion chambers promote a far more also burn, increasing motor efficiency, gas mileage, enhancing driveability and lowering detonation in required induction applications. Take a look at circulation numbers for our standard Raylar CNC heads and our special-order CNC Extreme cylinder heads making use of the website link below.

Mercruiser 496cid Cast Pistons Break

The stock 496 / 8.1L cast pistons are not built to resist the forces of extreme endurance use. We regularly see engines with broken, chipped and also shattered pistons which bring about catastrophic motor harm.

"Header-Proof" Porcelain Spark Plugs

8.1L motors with short and long tube headers consistently melt stock plug wires as well as overall performance spark-plug shoes. Ceramic spark plug wires eliminate burnt spark plug boots in ships, trucks, hot rods and RVs. If You Have had this dilemma before or wouldn't like to worry about it as time goes on, discover our 45 degree porcelain plug shoes that are ranked to endure severe temperatures as much as 2000°F!