MerCruiser Repower Engines
Two complementary repower lines for classic MerCruiser-powered boats: Quicksilver Plus Series — 100% new factory engines built with marine-grade internals — and Mercury Remanufacturing Plus-Series, fully remanufactured engines hot-tested with fuel and coolant before they leave the factory.
Both lines target pre-2008 California and pre-2010 49-state USA hulls. Because Plus Series engines are completely new (or fully remanufactured) and not a major repair assembly, the old engine being replaced must be returned per EPA 1068.240.
Mercury Remanufacturing Plus-Series engines ship with a one-year factory limited warranty; Mercury Product Protection adds up to two more years of coverage. Give us a call — we've likely got what you're looking for in stock.
Adapting a Plus Series engine to your boat
Plus Series engines are built for repower — many parts that come on engines used for new boat construction (transoms, trim pumps, Y-pipes, rigging, props, boat harnesses, riser kits, closed-cooling kits, steering cylinders, lubes, etc.) are not included and must be purchased separately. Adaptation typically requires:
- Transfer of flywheel housings, couplers and other hardware to adapt to various makes of drives and transoms.
- Changing engine couplers to match specific transmissions or customer preferences.
- Changing engine mounts from front to side, or using solid engine mounts.
- Use of Quicksilver kits to meet customer preferences or installation requirements found in the Repower Reference Manual included with the engine.
Quicksilver Plus Series — 100% New
Drop-in-ready new marine engines based on popular MerCruiser and Mercury Remanufacturing models. 100% new construction with marine-grade internals.
Mercury Remanufacturing Plus-Series
Fully remanufactured engines with marine-grade performance valve trains, pistons, induction systems and (in some cases) marine headers. Each engine is hot-tested with fuel and coolant for quality assurance.
Quicksilver Plus Series — Details
3.0L TKS Alpha — Engine Only
135 HP @ 4800 RPM · 181 cu. in. (3.0L)
3.0L TKS Alpha Sterndrive engine only — non-power steering with front engine mount. Turn Key Start carburetor with mechanical fuel pump.
Built with 100% new Quicksilver internals: cast iron block, large fillet-radii crankshaft, tri-metal bearings, 9.3:1 pistons, revised TKS carburetor calibration, 140 °F thermostat, NGK spark plugs and 1.5:1 rocker arms. Quicksilver cast iron cylinder heads with hardened seats, screw-in studs, Black-X valves and the exclusive Quicksilver combustion chamber allowing 4° BTDC base timing.
Audio warning horn for overheat, low oil pressure and low drive lube. EST analog ignition, single-point water drain (blue hoses), 14-pin harness. Provision for dealer-installed side engine mounts. Pilot bore machined into crankshaft to accept dealer-installed Volvo couplers. Shipped with MerCruiser Alpha coupler.
Replaces: 3.0L Alpha sterndrive engines.
| Fuel | 87 octane unleaded |
| Coupler | MerCruiser Alpha (included) |
| Ignition | EST analog |
| Harness | 14-pin |
4.5L MPI 250 Alpha — Engine Only
250 HP @ 5200 RPM · 275 cu. in. / 4.5L
275 cubic-inch / 4.5L fully dressed marine engine. 100% new cast iron engine block, raw-water cooling, sequential fuel injection with FSM, roller camshaft, cast iron cylinder heads, Engine Guardian, SmartCraft Ready.
Mechanical throttle and shift, 14-pin harness. Equipped with MerCruiser legacy engine mounts using 4" (102 mm) bolt centers. Includes some rigging: Clean Power harness, gauge harness and digital trim sender — the included digital trim sender must replace the sender in the installed transom.
Recommended for use with the Quicksilver Alpha Gen II transom 6-61000004P or legacy MerCruiser Alpha Gen II transoms. NOT compatible with the Alpha Gen II Digital Transom 6-61000002P due to incompatible engine mounts.
Replaces: Pre-2008 California and pre-2010 49-state USA boats using Quicksilver Alpha transoms.
| Fuel | 87 octane unleaded |
| Cooling | Raw water |
| Harness | 14-pin |
| Transom | Quicksilver Alpha Gen II 6-61000004P (or legacy MC Alpha Gen II) |
4.5L MPI 250 Bravo — Engine Only
250 HP @ 5200 RPM · 275 cu. in. / 4.5L
275 cubic-inch / 4.5L fully dressed marine engine. 100% new cast iron engine block, raw-water cooling, sequential fuel injection with FSM, roller camshaft, cast iron cylinder heads, Engine Guardian, SmartCraft Ready.
Mechanical throttle and shift, 14-pin harness. MerCruiser legacy engine mounts using 4" (102 mm) bolt centers. Includes Clean Power harness, gauge harness and a digital trim sender (required to replace the sender in the installed transom).
Recommended for use with the Quicksilver Bravo transom 6-62000025P or legacy MerCruiser Bravo transoms. NOT compatible with the Bravo Digital Transom 6-62000010P.
Replaces: Pre-2008 California and pre-2010 49-state USA boats using Quicksilver Bravo transoms.
| Fuel | 87 octane unleaded |
| Cooling | Raw water |
| Harness | 14-pin |
| Transom | Quicksilver Bravo 6-62000025P (or legacy MC Bravo) |
350 MPI Alpha — Engine Only
300 HP @ 5000 RPM · 350 cu. in.
350 cubic-inch fully dressed marine engine. 100% new Quicksilver: cast iron engine block, raw-water cooling with warm exhaust manifolds, special flame graphics, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, roller camshaft.
Quicksilver cast iron cylinder heads featuring Black-X valve tech, 1.5:1 stamped rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, 10-pin harness.
Replaces: 5.0 EFI, 5.0L MPI, 5.7L EFI and 350 MPI sterndrive Alpha models.
- If used with an Alpha One (Gen I) drive, this engine requires sea-water pump kit 46-8M0139983 and serpentine belt 57-865615Q03 (sold separately) for proper cooling.
| Fuel | 87 octane unleaded |
| Cooling | Raw water (warm exhaust manifolds) |
| Harness | 10-pin |
| ECM | ECM555 / Engine Guardian / SmartCraft Ready |
350 MPI Bravo — Engine Only
300 HP @ 5000 RPM · 350 cu. in.
350 cubic-inch fully dressed marine engine. 100% new Quicksilver: cast iron engine block, raw-water cooling with warm exhaust manifolds, flush system, special flame graphics, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, roller camshaft.
Quicksilver cast iron cylinder heads with Black-X valve tech, 1.5:1 stamped rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, 10-pin harness.
Replaces: 5.0 EFI, 5.0L MPI, 5.7L EFI and 350 MPI sterndrive Bravo models.
| Fuel | 87 octane unleaded |
| Cooling | Raw water (warm exhaust manifolds, flush system) |
| Harness | 10-pin |
| ECM | ECM555 / Engine Guardian / SmartCraft Ready |
6.2L MPI 300 Bravo — Engine Only
300 HP @ 5400 RPM · 377 cu. in. / 6.2L
377 cubic-inch / 6.2L fully dressed marine engine. 100% new cast iron engine block, raw-water cooling, sequential fuel injection with FSM, roller camshaft, cast iron cylinder heads, Engine Guardian, SmartCraft Ready.
Mechanical throttle and shift, 14-pin harness. MerCruiser legacy engine mounts using 4" (102 mm) bolt centers. Clean Power harness, gauge harness, and digital trim sender (required to replace the sender in the installed transom).
Recommended for use with the Quicksilver Bravo transom 6-62000025P or legacy MerCruiser Bravo transoms. NOT compatible with the Bravo Digital Transom 6-62000010P.
Replaces: Pre-2008 California and pre-2010 49-state USA boats using Quicksilver Bravo transoms.
| Fuel | 87 octane unleaded |
| Cooling | Raw water |
| Harness | 14-pin |
| Transom | Quicksilver Bravo 6-62000025P (or legacy MC Bravo) |
350 MPI Horizon Inboard — Down Angle
300 HP @ 4800 RPM · 350 cu. in.
350 cubic-inch fully dressed marine inboard engine, down-angle configuration. 100% new Quicksilver: cast iron engine block, closed-cooled engine block and exhaust manifolds, flush system, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, roller camshaft.
Quicksilver cast iron cylinder heads with Black-X valve tech, 1.5:1 stamped steel rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, premium dual-stage driveplate, inboard high-mount starter, 10-pin harness.
Replaces: All makes of Standard (LH) rotation small-block 5.7L and 6.2L inboard engines.
- Dealer must change driveplate if used with in-line transmissions.
| Fuel | 87 octane unleaded |
| Cooling | Closed (block + manifolds) |
| Rotation | Standard (LH) |
| Harness | 10-pin |
350 MPI Horizon Inboard — V-Drive
300 HP @ 4800 RPM · 350 cu. in.
350 cubic-inch fully dressed marine inboard engine, V-drive configuration. 100% new Quicksilver: cast iron engine block, closed-cooled engine block and exhaust manifolds, flush system, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, roller camshaft.
Quicksilver cast iron cylinder heads with Black-X valve tech, 1.5:1 stamped steel rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, premium dual-stage driveplate, inboard high-mount starter, 10-pin harness.
Replaces: All makes of Standard (LH) rotation small-block 5.7L and 6.2L inboard engines.
- Dealer must change driveplate if used with 71 / 72 V-drive transmissions.
| Fuel | 87 octane unleaded |
| Cooling | Closed (block + manifolds) |
| Rotation | Standard (LH) |
| Harness | 10-pin |
350 MPI Tow Sport — Engine + Inline Transmission
315 HP @ 5200 RPM · 350 cu. in.
Brand-new 350 cubic-inch fully dressed marine engine with ZF 45C inline transmission assembly. Standard (LH) rotation. Quicksilver 4.00" bore V8 iron block, new nodular iron 3.48" stroke crankshaft, multi-port fuel injection using Cool Fuel 3, dry-joint ski exhaust facing the flywheel, 75 mm TBU.
Two-piece aluminum intake manifold with iron base, new fuel injector and rail assembly, new sensors, new HVS assembly, serpentine belt accessory drive, high-lift billet steel roller camshaft, raw-water cooling, hand-removable blue drain plugs, new Quicksilver high-flow iron cylinder heads with Black-X valves, screw-in rocker studs, 9.4:1 pistons and 1.5:1 rocker arms.
Marine-grade starter, 65 A alternator, oil pan, sea pump, flame arrestor, circulating water pump, spark plugs and wires. ECM555 with Engine Guardian, SmartCraft Ready, 14-pin harness. Custom blue-flame hand-airbrushed engine cover. ZF 45C 1.00:1 aluminum transmission included with mounts, cooler, shift bracket, hoses, fluid filled, and 3" output flange.
Replaces: All models of MerCruiser Tow Sport inline engines built 1990-2015.
- Adaptation into a non-MerCruiser boat may require minor stringer / fuel-system changes — do NOT modify the engine’s mounts or fuel system to fit.
- S-pipes sold separately.
| Fuel | 87 octane unleaded |
| Transmission | ZF 45C 1.00:1 (included, fluid-filled) |
| Rotation | Standard (LH) |
| Alternator | 65 A |
| Harness | 14-pin |
383 MPI FWC Bravo — Engine Only
350 HP @ 5200 RPM · 383 cu. in.
383 cubic-inch fully dressed marine engine. 100% new Quicksilver: cast iron engine block, closed-cooled engine block and exhaust manifolds, flush system, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, roller camshaft.
Quicksilver cast iron cylinder heads with Black-X valve tech, 1.6:1 roller rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, 10-pin harness.
Replaces: 5.0 EFI, 5.0L MPI, 5.7L EFI, 350 MPI, 377 MPI, 7.4L, 7.4L EFI and 7.4L MPI sterndrive engines — including SeaCore and Horizon Bravo models.
| Fuel | 87 octane unleaded |
| Cooling | Closed (block + manifolds, flush system) |
| Harness | 10-pin |
| ECM | ECM555 / Engine Guardian / SmartCraft Ready |
6.2L MPI 350 Bravo FWC — Engine Only
350 HP @ 5400 RPM · 377 cu. in. / 6.2L
377 cubic-inch / 6.2L fully dressed marine engine. 100% new cast iron engine block, full fresh-water cooling with manifolds included, sequential fuel injection with FSM, roller camshaft, cast iron cylinder heads, Engine Guardian, SmartCraft Ready.
Mechanical throttle and shift, 14-pin harness. MerCruiser legacy engine mounts using 4" (102 mm) bolt centers. Clean Power harness, gauge harness, digital trim sender (required to replace the sender in the installed transom).
Recommended for use with DWP Bravo sterndrives on a Quicksilver Bravo transom 6-62000025P or legacy MerCruiser Bravo transoms S/N 2A514803 and up. If using a transom built prior to 2A514803 and/or without a DWP Bravo sterndrive, an external water pickup is required for proper cooling. NOT compatible with the Bravo Digital Transom 6-62000010P.
Replaces: Pre-2008 California and pre-2010 49-state USA boats using Quicksilver Bravo transoms.
| Fuel | 87 octane unleaded |
| Cooling | Full fresh-water cooling (manifolds included) |
| Harness | 14-pin |
| Transom | Quicksilver Bravo 6-62000025P (DWP required pre-2A514803 transoms) |
409 MPI FWC Bravo — Engine Only
400 HP @ 5800 RPM · 409 cu. in.
409 cubic-inch fully dressed marine engine. 100% new Quicksilver: cast iron engine block, closed-cooled engine block and exhaust manifolds, special flame graphics, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, high-flow aluminum circulating pump, roller camshaft.
Quicksilver aluminum cylinder heads featuring Black-X valve tech, shaft-mounted 1.6:1 roller rocker arms. ECM555, Engine Guardian, SmartCraft Ready, mechanical throttle and shift, 10-pin harness.
Replaces: 454 HO, 502 HO, 496 Mag and 406 HO sterndrive engines — including SeaCore and Horizon Bravo models.
| Fuel | 87 octane unleaded |
| Cooling | Closed (block + manifolds) |
| Cylinder heads | Quicksilver aluminum, Black-X |
| Harness | 10-pin |
Mercury Remanufacturing Plus-Series — Details
4.3L Alpha 4V EST — Engine Only
225 HP @ 4600 RPM · 4.3L
Fully dressed remanufactured marine engine. Features special flame graphics, 600 cfm 4-bbl carburetor, exclusive high-torque aluminum intake manifold with bronze water crossover and pads, electric fuel pump, 2-piece wet-joint exhaust.
Nodular iron crankshaft, billet steel roller camshaft, Vortec cast iron cylinder heads, stainless steel valves, 1.5:1 roller rocker arms, EST analog ignition, 10-pin harness.
Replaces: MerCruiser 4.3L and 5.0L sterndrive engines.
| Fuel | 87 octane unleaded |
| Induction | 600 cfm 4-bbl carburetor |
| Ignition | EST analog |
| Harness | 10-pin |
350 MPI Alpha — Engine Only
300 HP @ 5000 RPM · 5.7L / 350 cu. in.
Remanufactured 5.7L / 350 cu. in. fully dressed marine engine. Special flame graphics, multi-port fuel injection using Cool Fuel II, dry-joint exhaust, nodular iron crankshaft, roller camshaft.
Vortec cast iron cylinder heads, stainless steel valves, 9.4:1 hypereutectic pistons. ECM555 with Engine Guardian, SmartCraft Ready, 10-pin harness.
Replaces: 5.0L, 5.0L EFI/MPI, 5.7L, 5.7L EFI/MPI and 350 Mag MPI sterndrive engines.
- If used with an Alpha One (Gen I) drive, requires sea-water pump kit 46-807151A5 (sold separately) for proper cooling.
| Fuel | 87 octane unleaded |
| Cooling | Raw water |
| Harness | 10-pin |
| ECM | ECM555 / Engine Guardian / SmartCraft Ready |
383 Mag Stroker — Bravo Sterndrive
350 HP @ 5200 RPM · 383 cu. in.
Remanufactured 383 cu. in. stroker fully dressed marine engine. Special flame graphics, multi-port fuel injection using 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, 9.0:1 hypereutectic pistons, 1.6:1 roller rocker arms. ECM555 with Engine Guardian, SmartCraft Ready, 10-pin harness.
Replaces: 350 MAG, 6.2L MPI, 7.4L and 7.4L MPI sterndrive engines.
| Fuel | 87 octane unleaded |
| Crankshaft | 4340 forged steel |
| Pistons | 9.0:1 hypereutectic |
| Harness | 10-pin |
383 Mag Stroker Inboard — Down Angle
350 HP @ 5000 RPM · 383 cu. in.
Remanufactured 383 cu. in. fully dressed marine inboard engine. Special flame graphics, multi-port fuel injection using Gen 3 Cool Fuel, dry-joint exhaust, 100 PSI oil pump.
4340 forged steel crankshaft, high-lift billet steel camshaft, Vortec cast iron cylinder heads, stainless steel valves, 9.0:1 hypereutectic pistons, 1.6:1 roller rocker arms. Raw-water cooling, ECM555 with Engine Guardian, SmartCraft Ready, mechanical throttle and shift, premium dual-stage driveplate, inboard high-mount starter, 10-pin harness.
Replaces: All makes of Standard (LH) rotation 5.7L, 6.0L and 7.4L inboard engines.
- Dealer must change driveplate if used with in-line transmissions.
| Fuel | 87 octane unleaded |
| Cooling | Raw water |
| Rotation | Standard (LH) |
| Harness | 10-pin |