Equipment, Inc.

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Marine Service/Dealer List

Vortec 4.3L V6 (No longer in production)

Operations Manuals:
 Operator's Manual

Engine Dimensions:
 Engine Dimensions

Observed Power Curves:
 Power Curve


GM Powertrain takes its expertise in designing outstanding Vortec truck and SUV engines and leverages it to make sophisticated yet extremely durable marine engines. In addition, the well recognized Vortec brand name by itself has become a valuable selling tool for OEMs.

  • Lead-free main bearings and balance shaft rear bearing
  • Integral Air Fuel Module (IAFM) inlet manifold with port fuel injection available
  • Cracked powder metal connecting rod to more accurately position the cap to the rod during engine assembly. A high-flow cylinder head with straighter intake ports and a higher compression ratio delivers impressive horsepower
  • High-silicon cast aluminum pistons offer excellent durability
  • Roller valve lifters, roller rocker arms and true roller timing chain for reduced friction and improved performance
  • Composite rocker arm covers for reduced noise and resistance to corrosion
  • Cylinder case has brass water jacket core support plugs for resistance to corrosion
  • Water pump is effective rotating in either a clockwise or counterclockwise direction
  • Nodular iron crankshaft has rolled fillets for increased strength
  • Water pump casting eliminates internal bypass
  • Investment cast rocker arms
  • 58X crankshaft position encoder with digital sensor to ensure accurate ignition timing throughout the operating range
  • Cylinder block incorporates the following new features:
    • Dual flat response knock sensor bosses
    • Revised bolt pattern for new front cover
    • Threaded block heater/drain hole - left side
  • Cast aluminum front cover epoxy painted for corrosion protection
  • Aluminum oil pan is now painted for corrosion protection


  • Type: 4.3L V-6 (Gen 1e)
  • Displacement: 262 cid (4.3L cc)
  • Engine Orientation: Longitudinal
  • Compression Ratio: 9.4:1
  • Valve Configuration: Overhead Valves (2 valves per cylinder)
  • Assembly Site: Romulus, Michigan
  • Valve Lifters: Hydraulic Roller
  • Firing Order: 1-6-5-4-3-2
  • Bore x Stroke: 101.60 x 88.39 mm
  • Bore Center: 111.76 mm
  • Bore Area: 486.44 cm2
  • Fuel System: N/A (L35) or Port Fuel Injection with Electronic Throttle Body Unit (LG3)
  • Fuel Type: Regular Unleaded
  • Horsepower: 226 hp (169 kW) @ 4800 rpm
  • Torque: 268 lb-ft (363 Nm) @ 4000 rpm
    Actual power levels may vary depending on OEM calibration and application.
  • Fuel Shutoff: OEM Defined
  • Engine Mass: 707 lbs. (321 kg)
  • Emissions Controls: N/A
  • Materials:
    • Block: Cast Iron GM232-M
    • Cylinder Head: Cast Iron
    • Intake Manifold: Cast Iron
    • Exhaust Manifold: None
    • Main Bearing Caps: Cast Iron GM232-M
    • Crankshaft: Nodular Iron
    • Camshaft: 5150 Steel Billet
    • Connecting Rods: Powdered Metal

Information may vary with application. All specifications listed are based on the latest product information available at the time of publication. The right is reserved to make changes at any time without notice.

Additional Features

  • The ECM uses state-of-the-art technology to optimize fuel and spark requirements.
  • Electronic throttle control is standard except on 2V inlet manifold
  • A 2V inlet manifold is available.
  • Cylinder head gaskets have stainless steel core for corrosion resistance
  • Cast aluminum oil pan provides increased strength and noise reduction and is epoxy painted for corrosion protection
  • Nodular grey iron bearing caps
  • Metric fasteners on engine mounts, starter bosses and bell housing
  • Eccentric main bearings for increased engine life

10800 S.W. Herman Road
Tualatin, OR 97062
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