MerCruiser SternDrives    
Small-Block V-6 - 4.3L EFI 

Gas Carbureted

• 3.0L
• 4.3L
• 5.0L
• 5.7L

Gas Fuel Injected

• 4.3L EFI
• 5.0L EFI
• 350 MAG MPI
• 350 MAG MPI Horizon
• MX 6.2MPI
• MX 6.2MPI Horizon
• 496 MAG
• 496 MAG HO

Diesel

• D1.7L DTI
• 2.8L D-Tronic
• 4.2L-LD
• 4.2L
• 4.2L D-Tronic
• 7.3L D-Tronic-LD
• 7.3L D-Tronic

Performance Engines

• HP500 Bulldog™
• Scorpion 377
• HP500 EFI
• HP 575 SCI
• HP 900SC Dry Sump

The 4.3L EFI provides throttle body fuel injection for turnkey starts, smooth idling and self-diagnostic capabilities. This V-6 offers one of the best power-to-weight ratios in its class and is perfect for powering small-to-midsize runabouts and pontoons.

Small-Block V-6 - 4.3L EFI

4.3L EFI Specifications

• Propshaft Horsepower: 210 (157 kW)
• Displacement (Liter/CID): 4.3/262
• Cylinders: V-6
• Bore & Stroke (in/mm): 4.00 x 3.48/101 x 88
• Compression Ratio: 9.4:1
• Fuel System: TBI
• Full Throttle RPM Range: 4400-4800
• Ignition Type: Digital
• Alternator (amps/watts): 70/988
• Length (in/cm): 33/84
• Width (in/cm): 32/82
• Height (in/cm): 21/54
• Weight (lbs/kg) - Alpha: 857/389
• Weight (lbs/kg) - Bravo One: N/A
• Weight (lbs/kg) - Bravo Two: 904/410
• Weight (lbs/kg) - Bravo Three: 913/415

Transmission Ratios

• Gear Ratio - Alpha Drive (primary/optional/high altitude): 1.62/1.47/1.81
• Gear Ratio - Bravo One (primary/optional/high altitude): N/A
• Gear Ratio - Bravo Two (primary/optional/high altitude): 2.2/2.0/-
• Gear Ratio - Bravo Three (primary/optional/high altude): 2.2/2.43/-

Standard Features

• Audio warning system
• Ceramic-, EDP- coated and painted exhaust elbows
• Painted cast-iron exhaust manifolds
• Knock-control sensor
• MerCathode® (standard on all Bravo drives)
• Power steering
• Quick-drain oil system
• Remote oil filter
• Serpentine belt
• Dual 43 mm throttle body
• Water-cooled fuel system
• Multipoint manual water drain system
• Water/fuel separator

Optional Features

• Closed-cooling (kit)
• Compact hydraulic steering
• 3" risers
• Mercathode (optional kit on Alpha drive)

Boating Benefits

• Exclusive quick oil drain system that eliminates the need for a pump, simplifying routine maintenance.
• Ceramic- and EDP-coated exhaust elbows for outstanding corrosion resistance.
• Multipoint manual water drain system, which makes winterizing easy.
• Exclusive remote oil filter located atop the engine, simplifying routine maintenance.
• 70-amp alternator to handle the demands of today’s state-of-the-art electronic components.
• Water-separating fuel filter that prevents water from entering the fuel system.
• Water-cooled and insulated fuel system that keeps fuel temperatures at optimum levels while reducing the potential for vapor lock.
• Exclusive audio alarm system that warns you of low oil pressure, high water temperature and excessive transmission temperature.
• Exclusive drive lube monitor conveniently located atop the engine for easy access.
• Compact hydraulic steering available for pontoon applications, which is offered as a factory-installed option on the Alpha drive packages.
• Exclusive Mercury MerCruiser® service dealer network