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LS9 Long

LS9 Long

SKU: 12624262

As the foundation for the supercharged engine that powered the 2009-13 Corvette ZR1, our LS9 is a long-block built for boost – delivered without the supercharger or front-end accessory drive system, allowing the builder to finish the engine with the power adder of his or her choice. It is rated for 12 lbs. of boost.


The assembly includes a forged rotating assembly (including lightweight titanium connecting rods), rotocast aluminum cylinder heads with titanium intake valves and stainless hollow exhaust valves, multiple engine sensors and six ignition coils. It also includes a dry-sump oil pan, which requires the builder to add an external oil tank.

  • Horsepower

    638 HP

  • Torque

    604 LB-FT

  • Tech Specs

    • Engine Type: LS-Series Gen-IV Small-Block V-8
    • Displacement (cu. in.): 376 (6.2L)
    • Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92 mm)
    • Block: Cast-aluminum with six-bolt, cross-bolted main caps
    • Crankshaft (P/N 12641693): Forged steel with nine-bolt flange
    • Connecting Rods (P/N 12624231): Forged titanium
    • Pistions (P/N 19180414): Forged alumium
    • Camshaft Type (P/N 12638427): Hydraulic roller
    • Valve Lift (in.): .562 intake / .558 exhaust
    • Cylinder Heads (P/N 12621774): Aluminum L92-style ports; “as cast” with 68-cc chambers
    • Valve Size (in.): 2.160 titanium intake / 1.590; hollow, sodium-filled exhaust
    • Compression Ratio: 9.1:1
    • Rocker Arms (P/N 12696105 int.): Investment-cast, roller trunnion
    • Rocker Arms (P/N 12681275 exh.): Investment-cast, roller trunnion
    • Rocker Arm Ratio: 1.7:1
    • Recommended Fuel: Premium pump
    • Maximum recommend rpm: 6600
    • Reluctor Wheel: 58X
    • Balanced: Internal
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