Chev LS9 Long Block Crate Engine
Horsepower rating 638 hp
Torque rating 604 ft.lbs.
A factory foundation for boost
As the foundation for the supercharged engine that powered the 2009-13 Corvette ZR1 and the 2017 HSV GTSR W1, the 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 and HSV GTSR W1 legends in their own time. 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 cil 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 V8
Displacement (cu. in.): 376 (6:21L)
Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92 mm)
Block: Cast aluminium 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 aluminium
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): Aluminium 192-style ports "as cast" with 68cc 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
