MerCruiser 383 MAG STROKER 350 HP (865108R80)

MerCruiser 383 MAG STROKER 350 HP – Product Overview

The MerCruiser 383 MAG STROKER 350 HP (865108R80) is a remanufactured high-performance sterndrive engine built for boat owners who need reliable V8 repower strength. Designed as a 383 MAG Stroker Bravo sterndrive engine only, this package delivers 350 HP at 5200 RPM from a 383 cubic inch stroker marine engine.

This fully dressed marine engine includes several major performance and reliability features, including multi-port fuel injection, Cool Fuel II, Dry Joint Exhaust, 100 PSI oil pump, 4340 forged steel crankshaft, high-lift billet steel camshaft, Vortec cast iron cylinder heads, stainless steel valves, hypereutectic pistons, and roller rocker arms.

It also uses ECM555 with Engine Guardian, is SmartCraft ready, and includes a 10-pin harness for compatible marine installation setups.

For buyers comparing MerCruiser repower engines, 383 MAG Stroker engines, Bravo sterndrive engines, 350 HP marine engines, and replacement V8 sterndrive packages, the MerCruiser 383 MAG STROKER 865108R80 is a strong and practical option.

Built for MerCruiser Bravo Sterndrive Repower Projects

The MerCruiser 383 MAG STROKER 350 HP is designed for Bravo sterndrive applications, making it a strong choice for compatible MerCruiser repower projects.

Repowering a sterndrive boat requires more than matching horsepower. Buyers must confirm drive compatibility, engine mounts, coupler setup, exhaust layout, wiring harness, fuel system, cooling arrangement, control compatibility, and available engine room space.

This model is supplied as an engine only package, so buyers should confirm which external components, accessories, drive parts, and installation items are required for their specific boat.

The engine is listed as a replacement option for selected 350 MAG, 6.2L MPI, 7.4L, and 7.4L MPI sterndrive engines, making it relevant for owners upgrading or replacing older MerCruiser powerplants.

For customers searching for a MerCruiser 383 MAG Stroker Bravo engine for sale, this 865108R80 package is built for serious sterndrive repower use.

350 HP V8 Marine Performance

The MerCruiser 383 MAG STROKER 865108R80 is rated at 350 HP at 5200 RPM, giving compatible boats strong acceleration and dependable marine performance.

The 383 cubic inch stroker design gives this engine more displacement than a standard small-block 350, supporting stronger torque and improved pulling power. This can help compatible boats plane more confidently, carry heavier loads, and deliver better response during acceleration.

For many boat owners, the appeal of a stroker marine engine is its ability to deliver strong real-world torque without moving to a completely different engine platform.

This makes the 383 MAG Stroker suitable for performance boats, family runabouts, sport cruisers, and selected recreational vessels that require Bravo sterndrive compatibility.

For buyers searching for a 350 HP MerCruiser sterndrive engine, this model provides a strong and proven repower option.

Fully Dressed 383 Cubic Inch Stroker Engine

The MerCruiser 383 MAG STROKER 350 HP is described as a fully dressed marine engine, meaning it is supplied with key engine components already included for compatible installation planning.

The 383 cubic inch stroker configuration is built for increased displacement and stronger output. This engine includes internal and external performance features designed for marine use, including a 4340 forged steel crankshaft, high-lift billet steel camshaft, Vortec cast iron cylinder heads, stainless steel valves, 9.0:1 hypereutectic pistons, and 1.6:1 roller rocker arms.

These components support durability, airflow, combustion strength, and responsive power delivery.

For customers comparing MerCruiser 383 stroker engines, this model offers a strong feature set for compatible Bravo sterndrive applications.

Multi-Port Fuel Injection With Cool Fuel II

The MerCruiser 383 MAG STROKER 350 HP (865108R80) uses multi-port fuel injection with Cool Fuel II.

Multi-port fuel injection helps provide controlled fuel delivery to each cylinder, supporting smoother operation, improved throttle response, and more consistent performance compared with older carbureted systems.

The Cool Fuel II system helps manage fuel temperature and supports reliable fuel delivery in marine operating conditions.

For boat owners, this combination helps create a more modern operating experience, especially during starting, acceleration, cruising, and repeated throttle changes.

For customers searching for a MerCruiser MPI sterndrive engine, the 383 MAG Stroker offers fuel-injected performance in a strong V8 package.

Dry Joint Exhaust for Marine Durability

The MerCruiser 383 MAG STROKER includes Dry Joint Exhaust, an important marine engine feature designed to improve exhaust system reliability.

Dry Joint Exhaust helps reduce the chance of water leakage into areas where it can cause corrosion or engine damage when compared with older wet-joint exhaust designs. In marine environments, exhaust system design is especially important because water, heat, and corrosion can all affect long-term durability.

For repower buyers, Dry Joint Exhaust is a valuable feature because it supports better engine protection and service confidence.

Buyers should still confirm exhaust compatibility with their vessel, risers, manifolds, and existing installation setup before ordering.

For customers comparing MerCruiser Dry Joint Exhaust engines, this 383 MAG Stroker includes a strong marine-ready configuration.

ECM555 With Engine Guardian Protection

The MerCruiser 383 MAG STROKER 350 HP uses ECM555 engine control technology with Engine Guardian.

The ECM helps manage engine operation, fuel delivery, ignition, monitoring, and performance control. Engine Guardian is designed to help protect the engine by monitoring key operating conditions and responding when certain issues are detected.

For boat owners, this adds confidence because the engine is supported by electronic management and protection features rather than relying only on mechanical operation.

This system is especially valuable in performance and recreational marine use where the engine may operate under changing loads, speeds, and water conditions.

For customers searching for a SmartCraft ready MerCruiser engine, the ECM555 platform supports modern control and monitoring capability.

SmartCraft Ready With 10-Pin Harness

The MerCruiser 383 MAG STROKER 865108R80 is SmartCraft ready and includes a 10-pin harness.

SmartCraft readiness allows the engine to work with compatible MerCruiser digital monitoring and instrumentation systems. This can give boat owners access to important engine information, alerts, and performance data depending on the final helm setup.

The included 10-pin harness helps support connection to compatible MerCruiser installations, especially for repower projects replacing selected older sterndrive engines.

Buyers should confirm SmartCraft compatibility, gauge setup, harness connections, control system requirements, and any adapter needs before installation.

For repower buyers, correct wiring and instrumentation matching are essential for a smooth installation.

Built With Strong Internal Components

The MerCruiser 383 MAG STROKER 350 HP includes a strong internal component package designed for marine performance.

Key internal features include a 4340 forged steel crankshaft, high-lift billet steel camshaft, Vortec cast iron cylinder heads, stainless steel valves, 9.0:1 hypereutectic pistons, and 1.6:1 roller rocker arms.

These components help support durability, airflow, combustion efficiency, and responsive performance under marine load.

Marine engines work differently from automotive engines because they often operate under sustained load for extended periods. A strong internal package is important for dependable operation in watercraft applications.

For buyers comparing MerCruiser remanufactured marine engines, the 383 MAG Stroker offers a serious V8 build specification.

Runs on 87 Octane Fuel

The MerCruiser 383 MAG STROKER 350 HP (865108R80) is designed to run on 87 octane fuel.

This is a practical benefit for boat owners because it supports easier fuel planning and everyday usability. Instead of requiring specialty fuel, the engine is designed around commonly available octane requirements for compatible marine use.

Fuel quality still matters. Buyers should always use fuel that meets MerCruiser recommendations and follow proper storage, filtration, and maintenance practices.

For customers comparing 350 HP marine engines, the ability to run on 87 octane adds practical ownership value.

Special Flame Graphics for Distinctive Styling

The MerCruiser 383 MAG STROKER includes special flame graphics, giving the engine a distinctive performance-oriented appearance.

While performance, fitment, and reliability are the most important factors in a repower engine, styling can still matter for boat owners who value a clean engine compartment and recognizable MerCruiser presentation.

The flame graphics help identify the engine as a performance-focused 383 MAG Stroker package.

For customers who want a MerCruiser stroker engine with a stronger visual identity, this detail adds character to the overall package.

Why the MerCruiser 383 MAG STROKER 865108R80 Is a Smart Choice

The MerCruiser 383 MAG STROKER 350 HP (865108R80) stands out because it combines 350 HP output, 383 cubic inch stroker displacement, fully dressed marine packaging, multi-port fuel injection, Cool Fuel II, Dry Joint Exhaust, ECM555 with Engine Guardian, SmartCraft readiness, and strong internal components.

Many buyers in this category are replacing older MerCruiser sterndrive engines and need a package that fits compatible Bravo applications. The 865108R80 offers a focused repower solution for selected 350 MAG, 6.2L MPI, 7.4L, and 7.4L MPI replacement needs.

Its strong V8 architecture, fuel-injected operation, marine-specific exhaust design, and electronic engine protection make it a practical option for boaters wanting restored performance and modernized control.

For customers searching for a MerCruiser 383 MAG STROKER 350 HP 865108R80 for sale, this engine is a strong match for compatible Bravo sterndrive repower projects.

Who Should Choose This Sterndrive Engine

The MerCruiser 383 MAG STROKER 350 HP is best for boat owners, marine shops, and repower buyers who need a 350 HP Bravo sterndrive engine with stroker V8 performance and MerCruiser compatibility.

It is suitable for performance boats, sport cruisers, runabouts, recreational boats, and compatible MerCruiser sterndrive applications.

This engine is especially useful for buyers replacing selected 350 MAG, 6.2L MPI, 7.4L, or 7.4L MPI sterndrive engines.

Buyers who need an Alpha-compatible package, a complete sterndrive package, a different harness setup, a different fuel system, or a different horsepower rating should confirm compatibility before ordering.

Technical Specifications

Key Product Details and Specifications

The MerCruiser 383 MAG STROKER 350 HP (865108R80) is a remanufactured Bravo sterndrive engine only package.

It is rated at 350 HP at 5200 RPM.

The engine uses a 383 cubic inch stroker marine V8 configuration.

It is supplied as a fully dressed marine engine with special flame graphics.

The fuel system uses multi-port fuel injection with Cool Fuel II.

The engine includes Dry Joint Exhaust, helping support marine durability.

Internal features include a 4340 forged steel crankshaft, high-lift billet steel camshaft, Vortec cast iron cylinder heads, stainless steel valves, 9.0:1 hypereutectic pistons, and 1.6:1 roller rocker arms.

It uses ECM555 with Engine Guardian and is SmartCraft ready.

The package includes a 10-pin harness.

It is designed to run on 87 octane fuel.

It is listed as a replacement for selected 350 MAG, 6.2L MPI, 7.4L, and 7.4L MPI sterndrive engines.

Buy With Confidence

When buying the MerCruiser 383 MAG STROKER 350 HP (865108R80), customers should confirm Bravo sterndrive compatibility, existing engine model, coupler setup, exhaust compatibility, cooling configuration, fuel system requirements, wiring harness compatibility, SmartCraft integration, engine mount layout, and available engine room space.

This model is a strong choice for buyers who want a MerCruiser 383 MAG Stroker engine with 350 HP output, multi-port fuel injection, Dry Joint Exhaust, ECM555 control, Engine Guardian protection, and SmartCraft readiness.

Customers can compare this product with related MerCruiser 350 MAG engines, 6.2L MPI engines, 383 MAG Stroker variants, Bravo sterndrive packages, exhaust components, SmartCraft gauges, wiring harnesses, fuel system parts, and repower accessories.

Professional installation is recommended. Correct engine alignment, sterndrive compatibility, exhaust setup, fuel system connection, electrical integration, cooling system setup, and final commissioning help support reliable performance and long-term engine life.

Frequently Asked Questions

What is the MerCruiser 383 MAG STROKER 350 HP best used for?

The MerCruiser 383 MAG STROKER 350 HP (865108R80) is best used for compatible Bravo sterndrive repower projects, performance boats, sport cruisers, runabouts, and selected recreational marine applications.

Is this a Bravo or Alpha engine?

This model is listed as a 383 MAG Stroker Bravo sterndrive engine only package. Buyers should confirm compatibility before purchase.

How much power does the MerCruiser 383 MAG STROKER produce?

The engine is rated at 350 HP at 5200 RPM.

What displacement is this engine?

The MerCruiser 383 MAG STROKER uses a 383 cubic inch stroker marine engine configuration.

What fuel system does this engine use?

It uses multi-port fuel injection with Cool Fuel II, supporting controlled fuel delivery and responsive marine performance.

Does this engine have SmartCraft compatibility?

Yes, the engine is SmartCraft ready and includes a 10-pin harness for compatible MerCruiser installations.

What engines can this replace?

This engine is listed as a replacement for selected 350 MAG, 6.2L MPI, 7.4L, and 7.4L MPI sterndrive engines.

What fuel does this MerCruiser engine use?

The engine is designed to run on 87 octane fuel.