Remanufacturing: Sterndrive & Inboard Engines

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Factory reliability at an affordable price!

First off, you want to keep your boat. And why not? You love it. And it's rigged just how you want it. Now on to the engine. Maybe it has lost a little of its power over the years. A little bit of its throttle. That happens. But guess what? You can get it back. All of it. Back to the original specs, the original performance, the original thrills. Maybe even with a few engineering upgrades.

That's how good MerCruiser® Remanufacturing is. Your boat. Your engine. Back to the way it was. Or better. And for a fraction of the cost of a new boat or motor.

Grand Sport Center Inc is an authorized Mercruiser sterndrive dealership with Master Technicians at both of our convenient Chicagoland locations.

847-458-6488 - Lake in the Hills, IL

815-941-2220 - Morris, IL


Mercury® Remanufacturing  Plus-Series Bravo Sterndrives   The ideal replacement engine, completely renewed to original specs.   357 MAG Bravo 4V - 325 Crankshaft Horsepower   Thanks to its size and power, this is the ideal replacement engine for 5.0L, 350 MAG, 7.4L and 454 engines that power cruisers, small sport boats and large runabouts.   383 MPI Bravo - Freshwater Cooled 350HP   With 350hp and a full closed cooling system that supplies fresh water cooling to the engine and exhaust manifolds, this model is ready to repower 350 & 377 Bravo Horizon and SeaCore engines.   383 MAG Bravo 4V - 350 Crankshaft Horsepower   Same power and more torque than a 454 HO carbureted engine. This torque monster delivers 429 ft-lbs of raw torque at 3800 RPM to launch even the heaviest boats with authority. When equipped with the same marine exhaust headers as found on the 383 Scorpion®, this engine produces 370 HP and 456 ft-lbs of torque—more than a 502 carbureted engine. This is the ideal replacement engine for 454HO and 502 HO carbureted engines that power cruisers, large runabouts, and sport boats. Marine exhaust headers sold separately.

Mercury® Remanufacturing
Plus-Series Bravo Sterndrives

The ideal replacement engine, completely renewed to original specs.

357 MAG Bravo 4V - 325 Crankshaft Horsepower

Thanks to its size and power, this is the ideal replacement engine for 5.0L, 350 MAG, 7.4L and 454 engines that power cruisers, small sport boats and large runabouts.

383 MPI Bravo - Freshwater Cooled 350HP

With 350hp and a full closed cooling system that supplies fresh water cooling to the engine and exhaust manifolds, this model is ready to repower 350 & 377 Bravo Horizon and SeaCore engines.

383 MAG Bravo 4V - 350 Crankshaft Horsepower

Same power and more torque than a 454 HO carbureted engine. This torque monster delivers 429 ft-lbs of raw torque at 3800 RPM to launch even the heaviest boats with authority. When equipped with the same marine exhaust headers as found on the 383 Scorpion®, this engine produces 370 HP and 456 ft-lbs of torque—more than a 502 carbureted engine. This is the ideal replacement engine for 454HO and 502 HO carbureted engines that power cruisers, large runabouts, and sport boats. Marine exhaust headers sold separately.


Mercury® Remanufacturing  Plus-Series Alpha Sterndrives   A line to repower sterndrive boats with value performance.  Ready to pair up with an Alpha® drive.   3.0 Alpha® TKS - 135 Crankshaft Horsepower   The ideal repower for your runabout or pontoon boat using the classic front engine mount system. No Power Steering - The best value available with Turn Key Starting.   4.3L Alpha 4V - 225 Crankshaft Horsepower   WOW! A V-6 that makes more power than a 5.0L V-8. Replaces 4.3L- and 5.0L-powered runabouts while delivering V-6 fuel economy.   357 Alpha 4V - 275 Crankshaft Horsepower   Don't just repower--power up! The world-famous 357 Alpha will breathe new life into your runabout, sport boat or pontoon boat when replacing a 4.3L, 5.0L, or 5.7L engine.

Mercury® Remanufacturing
Plus-Series Alpha Sterndrives

A line to repower sterndrive boats with value performance.

Ready to pair up with an Alpha® drive.

3.0 Alpha® TKS - 135 Crankshaft Horsepower

The ideal repower for your runabout or pontoon boat using the classic front engine mount system. No Power Steering - The best value available with Turn Key Starting.

4.3L Alpha 4V - 225 Crankshaft Horsepower

WOW! A V-6 that makes more power than a 5.0L V-8. Replaces 4.3L- and 5.0L-powered runabouts while delivering V-6 fuel economy.

357 Alpha 4V - 275 Crankshaft Horsepower

Don't just repower--power up! The world-famous 357 Alpha will breathe new life into your runabout, sport boat or pontoon boat when replacing a 4.3L, 5.0L, or 5.7L engine.

Mercury® Remanufacturing  Plus-Series Inboards   Value performance for your inboard repower.  Standard and opposite rotation versions are available.   383 MAG Inboard 4V - 350 Crankshaft Horsepower   Thanks to its size and power this is the ideal replacement engine for 350 MAG, 7.4L, and 7.4L MPI engines that power cruisers, small boats and large runabouts.   8.1L Horizon Inboard - 370 Crankshaft Horsepower   The ideal big-block repower for your inboard yacht. This is the ideal replacement inboard engine for any make of 7.4, 454, 8.2, 502 or 8.1 engines that power twin-engine inboard boats.

Mercury® Remanufacturing
Plus-Series Inboards

Value performance for your inboard repower.

Standard and opposite rotation versions are available.

383 MAG Inboard 4V - 350 Crankshaft Horsepower

Thanks to its size and power this is the ideal replacement engine for 350 MAG, 7.4L, and 7.4L MPI engines that power cruisers, small boats and large runabouts.

8.1L Horizon Inboard - 370 Crankshaft Horsepower

The ideal big-block repower for your inboard yacht. This is the ideal replacement inboard engine for any make of 7.4, 454, 8.2, 502 or 8.1 engines that power twin-engine inboard boats.


Remanufactured Longblock Features   Marine duty gaskets  Hypereutectic pistons (stronger than factory pistons)  All new marine valves & valve springs  Marine cylinder heads  New marine water pump  New or polished marine camshaft - never reground!  Exclusive MerCruiser 350 & 377 camshaft profiles available  Timing cover included  Marine oil pan & windage tray  100% Inspection Before Shipment Hot Tested Pressure checked Compression checked UV light & dye leak check  New high flow oil pump  CNC machined remanufactured MerCruiser marine block Line bored Cam & mains Max 0.040" CNC Overbore CNC honed CNC deck machining

Remanufactured Longblock Features

Marine duty gaskets

Hypereutectic pistons (stronger than factory pistons)

All new marine valves & valve springs

Marine cylinder heads

New marine water pump

New or polished marine camshaft - never reground!

Exclusive MerCruiser 350 & 377 camshaft profiles available

Timing cover included

Marine oil pan & windage tray

100% Inspection Before Shipment Hot Tested Pressure checked Compression checked UV light & dye leak check

New high flow oil pump

CNC machined remanufactured MerCruiser marine block Line bored Cam & mains Max 0.040" CNC Overbore CNC honed CNC deck machining

Remanufactured Pro-Series Longblocks   As the original equipment manufacturer, Mercury® has the benefit of engineering resources and the experience to remanufacture a true marine-based engine. Every Pro-Series longblock is completely remanufactured with components suitable for marine applications. In fact, the valves, pistons and oil pump are all completely replaced with new pieces that have heavy-duty specifications that exceed those found in most new marine engines.

Remanufactured Pro-Series Longblocks

As the original equipment manufacturer, Mercury® has the benefit of engineering resources and the experience to remanufacture a true marine-based engine. Every Pro-Series longblock is completely remanufactured with components suitable for marine applications. In fact, the valves, pistons and oil pump are all completely replaced with new pieces that have heavy-duty specifications that exceed those found in most new marine engines.