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.

Whether you use a supercharger or turbo system, the LS9 long block is the assembled foundation developed for the boost you want to make. It made the C6 ZR1 a legend in its own time—and there’s no telling where its performance potential will take your project!

INSTALLATION NOTES
• Assembly does not include any electronics
• Includes dry-sump oil pan and requires external oil tank (not included). Oil pan change required for wet-sump oiling
• Includes 9-bolt crankshaft flange that may require adapter for use with some transmissions
• Induction system and front-end accessory drive system not included
• Not intended for marine applications

TECH SPECS
Part Number: 12624262
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
Pistons (P/N 19180414): Forged aluminum
Camshaft Type (P/N 12638427): Hydraulic roller
Valve Lift (in.): .562 intake / .558 exhaust
Camshaft Duration (@.050 in.): 211° intake / 230° 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 Recommended rpm: 6600
Reluctor Wheel: 58X
Balanced: Internal