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LS3 - 430 HP - 2008 Corvette Motor

Starting with the '08 Corvette, the world was first introduced to GM's latest small block V8 creation - the 6.2-liter LS3. A continuation of the industry leading V8 engines from GM Powertrain, the LS3 kicks out 430 horsepower and 424 lb.-ft. of torque. (In the Corvette, those numbers go to 436 hp and 428 lb.-ft. of torque with the optional dual mode exhaust system.) It's a brute of a small block with 376 ready cubes at your beckon call.

The LS series of engines from GM Powertrain have broken new ground for efficiency and performance from a pushrod platform engine. The LS3 continues the engineering breakthroughs with revised cylinder heads featuring rectangle ports borrowed from the vaunted LS7. The heads feature 63 cc combustion chambers, 2.16-inch intake valves, and 1.59-inch exhaust valves. The camshaft features an aggressive .551-inches of lift on the intake side with less overlap (than the LS2) for even greater airflow and power. Rocker arms with a 1.7:1 ratio sit on top of the heads.

In the bottom end, the aluminum 6-bolts/main block features 4.06-inch bores and 3.62-inch stroke. A nodular iron crankshaft, powdered metal rods, and aluminum pistons (10.7:1 compression ratio) round out a rev-happy short block. Red line for the LS3 comes at 6600 rpm, and you will get there very quickly.

With a high-tech GM foundation, aluminum block, and high flowing rectangular-port heads, the LS3 is the new standard in the small block world. The LS3 helps power the new Corvette to a top speed of 190 mph. What will it power you to?

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 19201992
Balanced: Internal
Block Part Number: 12584727
Block Type: Cast aluminum with 6-bolt main caps
Bore x stroke (in): 4.06 x 3.62 (103.25 x 92mm)
Camshaft duration (@.050 in): 204 degree intake / 211 degree exhaust
Camshaft Part Number: 12603844
Camshaft Type:Hydraulic roller
Compression ratio: 10.7:1
Connecting rods (P/N 12617570): Powdered metal
Connecting rods (P/N 12617570): Powdered metal
Crankshaft (P/N 12597569): Nodular iron
Crankshaft (P/N 12597569): Nodular iron
Cylinder heads (P/N 12598594): LS3 rectangle port; as cast with 68cc chambers
Cylinder heads (P/N 12598594): LS3 rectangle port; as cast with 68cc chambers
Displacement (cu in): 376 cu in (6.2L)
Engine type: LS Series Gen IV small-block V-8
Maximum recommended rpm: 6600
Pistons Part Number: 19165089
Pistons Type: Hypereutectic aluminum
Recommended fuel: 92 octane
Reluctor wheel: 58X
Rocker arm ratio: 1.7:1
Rocker Arms exhaust Part Number: 10214664
Rocker arms exhaust Type: Investment cast, roller trunnion
Rocker arms intake Part Number: 12569167
Rocker arms intake Type: Investment cast, roller trunnion
Valve Lift (in): .551 intake / .522 exhaust
Valve size (in): 2.16 intake / 1.59 exhaust

Chevy Performance LS3 430 HP engine

Part #: 19201992

LS3 430 HP dyno image