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Parts intended for competition use

Proposition 65

Chevrolet Performance Parts LS3 Crate Engine

Gen IV LS Power

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Parts intended for competition use

Proposition 65

Up to

638 hp

Two Yellow Gears Slightly Apart with an Arrow Pointing at a Curve from the Left One to the Other

Up to

604 _lb.-ft.

Up to

6,800

Max Rec RPM

Up to

376 cu. in. (6.2L)

Displacement

LS3 Engines

LS3

View Engine

The trusted, rugged and reliable choice — with plenty of torque and horsepower.

View Engine

The trusted, rugged and reliable choice — with plenty of torque and horsepower.

Tech Specs

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Performance

Horsepower:

430 hp @ 5,900 rpm

Torque:

425 lb.-ft. @ 4,600 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540155

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast aluminum with 6-bolt, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.622 in. (103.25 x 92mm)

Valve Lift (in):

.551 intake / .522 exhaust

Camshaft Duration (@.050 in):

204° intake / 211° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

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Tech Specs

Performance

Horsepower:

430 hp @ 5,900 rpm

Torque:

425 lb.-ft. @ 4,600 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540155

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast aluminum with 6-bolt, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Measurements

Bore x Stroke:

4.065 in. x 3.622 in. (103.25 x 92mm)

Valve Lift (in):

.551 intake / .522 exhaust

Camshaft Duration (@.050 in):

204° intake / 211° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

View in 2025 Catalog
LS364/450

View Engine

A popular builder's choice — LS6 camshaft and aluminum cylinder heads.

View Engine

A popular builder's choice — LS6 camshaft and aluminum cylinder heads.

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

452 hp @ 5,600 rpm

Torque:

441 lb.-ft. @ 4,800 rpm

Max Rec RPM:

6,800

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

LS6 hydraulic roller

Rocker Arms:

Investment-cast, roller bearing trunnion

Engine Basics

Part Number:

19434650

Engine Type:

Performance LQ9 long-block

Displacement:

364 cu. in. (6.0L)

Block:

Cast iron with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Measurements

Bore x Stroke:

4.000 x 3.622 in (101.6 x 92 mm)

Valve Lift (in):

.550 intake / .550 exhaust

Camshaft Duration (@.050 in):

204° intake / 218° exhaust

Compression Ratio:

10.3:1 (nominal)

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

LS3 rectangular port; aluminum, as-cast with 68cc chambers

Valve Size (in.):

2.165 intake (hollow stem)
1.590 exhaust (solid stem)

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

24Xe

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Locate a Dealer

Tech Specs

Performance

Horsepower:

452 hp @ 5,600 rpm

Torque:

441 lb.-ft. @ 4,800 rpm

Max Rec RPM:

6,800

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

LS6 hydraulic roller

Rocker Arms:

Investment-cast, roller bearing trunnion

Engine Basics

Part Number:

19434650

Engine Type:

Performance LQ9 long-block

Displacement:

364 cu. in. (6.0L)

Block:

Cast iron with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

LS3 rectangular port; aluminum, as-cast with 68cc chambers

Valve Size (in.):

2.165 intake (hollow stem)
1.590 exhaust (solid stem)

Measurements

Bore x Stroke:

4.000 x 3.622 in (101.6 x 92 mm)

Valve Lift (in):

.550 intake / .550 exhaust

Camshaft Duration (@.050 in):

204° intake / 218° exhaust

Compression Ratio:

10.3:1 (nominal)

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

24Xe

View in 2025 Catalog
LS376/480

View Engine

A hot, racing-inspired camshaft on the LS3 — the best of both worlds.

View Engine

A hot, racing-inspired camshaft on the LS3 — the best of both worlds.

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

495 hp @ 6,200 rpm

Torque:

473 lb.-ft. @ 5,000 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540156

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.622 in. (103.25 x 92mm)

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

219° intake / 228° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

495 hp @ 6,200 rpm

Torque:

473 lb.-ft. @ 5,000 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540156

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Measurements

Bore x Stroke:

4.065 in. x 3.622 in. (103.25 x 92mm)

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

219° intake / 228° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

View in 2025 Catalog
LS376/515

View Engine

Pure muscle with a proven track record — designed to pair with carburetor models.

View Engine

Pure muscle with a proven track record — designed to pair with carburetor models.

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

533 hp @ 6,600 rpm

Torque:

477 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19435102

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.622 in.

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

533 hp @ 6,600 rpm

Torque:

477 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19435102

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Measurements

Bore x Stroke:

4.065 in. x 3.622 in. (103.25 x 92mm)

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

View in 2025 Catalog
LS376/525

View Engine

LS3 treated with an ASA camshaft for an engine that thrives in high rpm.

View Engine

LS3 treated with an ASA camshaft for an engine that thrives in high rpm.

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

525 hp @ 6,200 rpm

Torque:

486 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540157

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.622 in.

Valve Lift (in.):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in):

2.165 intake / 1.590 exhaust

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

525 hp @ 6,200 rpm

Torque:

486 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powdered metal

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19540157

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Available Build Options:

Also available in Long Block

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust

Measurements

Bore x Stroke:

4.065 in. x 3.622 in.

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

View in 2025 Catalog
LS9 Long Block

View Engine

The foundation for the supercharged Gen VI Corvette — ready to be customized.

View Engine

The foundation for the supercharged Gen VI Corvette — ready to be customized.

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

638 hp @ 6,500 rpm

Torque:

604 lb.-ft. @ 3,800 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Forged steel with nine-bolt flange

Connecting Rods:

Forged titanium

Pistons:

Forged aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

12624262

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.622 in.

Valve Lift (in.):

.562 intake / .558 exhaust

Camshaft Duration (@.050 in):

211° intake / 230° exhaust

Compression Ratio:

9.1:1

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in):

2.160 titanium intake / 1.590 hollow, sodium-filled exhaust

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

638 hp @ 6,500 rpm

Torque:

604 lb.-ft. @ 3,800 rpm

Max Rec RPM:

6,600

Internal Components

Crankshaft:

Forged steel with nine-bolt flange

Connecting Rods:

Forged titanium

Pistons:

Forged aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

12624262

Engine Type:

LS-Series Gen-IV Small-Block V-8

Displacement:

376 cu. in. (6.2L)

Block:

Cast-aluminum with 6-bolt block, cross-bolted main caps

Balanced:

Internal

Cylinder Heads and Valves

Cylinder Heads:

Aluminum L92-style port; as-cast with 68cc chambers

Valve Size (in.):

2.160 titanium intake / 1.590 hollow, sodium-filled exhaust

Measurements

Bore x Stroke:

4.065 in. x 3.622 in.

Valve Lift (in):

.562 intake / .558 exhaust

Camshaft Duration (@.050 in):

211° intake / 230° exhaust

Compression Ratio:

9.1:1

Rocker Arm Ratio:

1.7:1

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

View in 2025 Catalog