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Marine Service/Dealer List

Vortec 6.0L V8 VVT (LY6)

Operations Manuals:
 Operator's Manual

Engine Dimensions:
 Engine Dimensions

Observed Power Curves:
 Power Curve


Factory-installed EFI hardware, including coil-near-plug ignition, is standard on the Vortec 6.0L GEN-IV marine engine.

  • Cast iron deep-skirt cylinder block with six-bolt main bearing caps that limit crankshaft flex and stiffen the engine's structure
  • Cast aluminum structural oil pan for additional rigidity
  • High-flow aluminum cylinder head design
  • Variable valve timing using a hydraulic cam phaser* to retard cam timing for low end torque and advance cam timing for high rpm horsepower
  • Steel camshaft, hydraulic roller lifters, and steel roller rocker arms for reduced friction and excellent durability
  • Returnless fuel injection with stainless steel fuel rail
  • Electronic Throttle Body fully compatible with electronic throttle control software in the MEFI-5 engine control module
  • Coil-near-plug ignition system with 58X crankshaft position encoder, 4X cam sensor, and dual flat response knock sensors for precise control of ignition timing under all operating conditions
  • Iridium tip long-life spark plugs with improved “self-cleaning” properties which decrease the potential for plug fouling
  • External water crossover integrated into the water pump casting so that no coolant flows through the composite intake manifold
  • Inconnel (high temperature) exhaust valves for long-term durability
  • Revised cam phaser for improved idle quality
  • Shallow sump oil pan for marine applications
  • Floating pin pistons which reduce noise and increase durability
  • Heavy-duty timing chain with a new leaf spring dampener to ensure quiet operation and long-term durability
  • New oil pressure sensor (more robust) - no impact on mating connector/pinout/cal - black insulator
  • Reduced hex height spark plugs - lower boot insertion force, no change in functionality - mid-year change
  • Sil-1 nitrided intake valve added (for future E85 capability)
  • Block and camshaft revisions to accept Al-Sn (Pb-free) cam bearings
  • Brico 3010 intake/exhaust seat inserts (E85 capability)
  • LS9 timing chain tensioner (improved durability)

*Camshaft Phasing: the L96 features variable valve timing, maximizing engine performance for given demands and conditions. At idle, for example, the cam is at the full advanced position, allowing exceptionally smooth idling. Under other conditions, the phaser adjusts to deliver optimal valve timing for performance, drivability and fuel economy. At high RPMs, it may retard timing to maximize airflow through the engine and increase horsepower. At low RPMs, it can advance timing to increase torque. Under light loads, it can retard timing at all engine speeds to improve fuel economy.


  • Type: 6.0L V-8 VVT (Gen-IV Small Block)
  • Displacement: 364 cid (5967 cc)
  • Engine Orientation: Longitudinal
  • Compression Ratio: 9.6:1
  • Valve Configuration: Overhead Valves (2 valves per cylinder)
  • Assembly Site: Romulus, Michigan
  • Valve Lifters: Hydraulic Roller
  • Firing Order: 1-8-7-2-6-5-4-3
  • Bore x Stroke: 101.6 X 92 mm
  • Bore Center: 111.76 mm
  • Bore Area: 648.59 cm2
  • Fuel System: Port Fuel Injection
  • Fuel Type: Regular Unleaded
  • Horsepower: 364 hp (287 kW) @ 5000 rpm
  • Torque: 400 lb-ft (542 Nm) @ 4400 rpm
    Actual power levels may vary depending on OEM calibration and application.
  • Max. Engine Speed: 5000 rpm
  • Engine Mass: 761 lb (345 kg)
  • Emissions Controls: Positive Crankcase Ventilation (PCV)
  • Materials:
    • Block: Cast Iron
    • Cylinder Head: Cast Aluminum
    • Intake Manifold: Composite
    • Main Bearing Caps: Powder Metal
    • Crankshaft: Cast Iron with Undercut and Rolled Fillets
    • Camshaft: Steel
    • Connecting Rods: Forged Powder 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 control.
  • Flat-faced flywheel 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

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Tualatin, OR 97062
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