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Owner's Support

Parts intended for competition use only*

Proposition 65 Warning*

A Chevrolet Performance Parts 383 Crate Engine

Classic Small-Block Strokers

Locate a Dealer

Parts intended for competition use only^*

Proposition 65 Warning^*

Up to

450 hp

Horsepower

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

Up to

455 lb.-ft.

Torque^*

Up to

6,000

Max Recommended RPM

Up to

383 cu. in. (6.3L)

Displacement

383 Engines

HT383

Serious pulling power for the non-stock truck rebuild.

View HT383

Serious pulling power for the non-stock truck rebuild.

View HT383

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

323 hp @ 4,200 rpm

Torque:

444 lb.-ft. @ 3,000 rpm

Max Rec RPM:

5,000

Internal Components

Crankshaft:

4340 forged steel; includes 4X crankshaft position sensor

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Intake Manifold:

Dual plane aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Stamped steel

Engine Basics

Part Number:

19433036

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.431 intake / .451 exhaust

Camshaft Duration (@.050 in):

196° intake / 206° exhaust

Compression Ratio:

9.1:1

Rocker Arm Ratio:

1.5:1

Cylinder Head and Valves

Cylinder Heads:

Vortec iron; 62cc chambers

Valve Size (in.):

1.940 intake / 1.500 exhaust

Water Pump:

Cast iron

Fuel and Ignition

Ignition Timing:

32° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Regular pump

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

323 hp @ 4,200 rpm

Torque:

444 lb.-ft. @ 3,000 rpm

Max Rec RPM:

5,000

Engine Basics

Part Number:

19433036

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.431 intake / .451 exhaust

Camshaft Duration (@.050 in):

196° intake / 206° exhaust

Compression Ratio:

9.1:1

Rocker Arm Ratio:

1.5:1

Internal Components

Crankshaft:

4340 forged steel; includes 4X crankshaft position sensor

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Intake Manifold:

Dual plane aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Stamped steel

Cylinder Head and Valves

Cylinder Heads:

Vortec iron; 62cc chambers

Valve Size (in.):

1.940 intake / 1.500 exhaust

Water Pump:

Cast iron

Fuel and Ignition

Ignition Timing:

32° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Regular pump

#/#

View in 2025 Catalog
HT383E

Bigger is better — the high torque bolt-in engine for half-ton trucks.

View HT383E

Bigger is better — the high torque bolt-in engine for half-ton trucks.

View HT383E

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

323 hp @ 4,200 rpm

Torque:

444 lb.-ft. @ 3,000 rpm

Max Rec RPM:

5,000

Internal Components

Crankshaft:

4340 forged steel; includes 4X crankshaft position sensor

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Stamped steel

Engine Basics

Part Number:

19435449

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.431 intake / .451 exhaust

Camshaft Duration (@.050 in):

196° intake / 206° exhaust

Compression Ratio:

9.4:1

Rocker Arm Ratio:

1.5:1

Cylinder Head and Valves

Cylinder Heads:

Vortec iron; 62cc chambers

Valve Size (in.):

1.940 intake / 1.500 exhaust

Water Pump:

Cast iron

Fuel and Ignition

Flexplate:

12.750”

Recommended Fuel:

Regular pump

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

323 hp @ 4,200 rpm

Torque:

444 lb.-ft. @ 3,000 rpm

Max Rec RPM:

5,000

Engine Basics

Part Number:

19435449

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.431 intake / .451 exhaust

Camshaft Duration (@.050 in):

196° intake / 206° exhaust

Compression Ratio:

9.4:1

Rocker Arm Ratio:

1.5:1

Internal Components

Crankshaft:

4340 forged steel; includes 4X crankshaft position sensor

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Stamped steel

Cylinder Head and Valves

Cylinder Heads:

Vortec iron; 62cc chambers

Valve Size (in.):

1.940 intake / 1.500 exhaust

Water Pump:

Cast iron

Fuel and Ignition

Flexplate:

12.750”

Recommended Fuel:

Regular pump

#/#

View in 2025 Catalog
SP383 Turnkey

Rev higher and haul harder — expanded RPM range and horsepower.

View SP383 Turnkey

Rev higher and haul harder — expanded RPM range and horsepower.

View SP383 Turnkey

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

435 hp @ 5,600 rpm

Torque:

445 lb.-ft. @ 4,600 rpm

Max Rec RPM:

6,000

Internal Components

Crankshaft:

Forged steel

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Intake Manifold:

Single-plane aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Aluminum roller style

Engine Basics

Part Number:

19435452

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.509 intake / .528 exhaust

Camshaft Duration (@.050 in):

222° intake / 230° exhaust

Compression Ratio:

9.72:1

Rocker Arm Ratio:

1.5:1

Cylinder Head and Valves

Cylinder Heads:

Fast Burn aluminum; 62cc chambers

Valve Size (in.):

2.000 intake / 1.550 exhaust

Fuel and Ignition

Ignition Timing:

36° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Premium pump

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

435 hp @ 5,600 rpm

Torque:

445 lb.-ft. @ 4,600 rpm

Max Rec RPM:

6,000

Engine Basics

Part Number:

19435452

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.509 intake / .528 exhaust

Camshaft Duration (@.050 in):

222° intake / 230° exhaust

Compression Ratio:

9.72:1

Rocker Arm Ratio:

1.5:1

Internal Components

Crankshaft:

Forged steel

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Intake Manifold:

Single-plane aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Aluminum roller style

Cylinder Head and Valves

Cylinder Heads:

Fast Burn aluminum; 62cc chambers

Valve Size (in.):

2.000 intake / 1.550 exhaust

Fuel and Ignition

Ignition Timing:

36° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Premium pump

#/#

View in 2025 Catalog
SP383 EFI Turnkey

Classic performance paired with Fast Burn cylinder heads and EFI.

View SP383 EFI Turnkey

Classic performance paired with Fast Burn cylinder heads and EFI.

View SP383 EFI Turnkey

Tech Specs

View in 2025 Catalog

Performance

Horsepower:

450 hp @ 5,800 rpm

Torque:

436 lb.-ft. @ 4,800 rpm

Max Rec RPM:

6,000

Internal Components

Crankshaft:

Forged steel

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Camshaft Type:

Steel hydraulic roller

Rocker Arms:

Aluminum roller style

Engine Basics

Part Number:

19433046

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.509 intake / .528 exhaust

Camshaft Duration (@.050 in):

220° intake / 230° exhaust

Compression Ratio:

9.9:1 (nominal)

Rocker Arm Ratio:

1.5:1

Cylinder Head and Valves

Cylinder Heads:

Fast Burn aluminum; 62cc chambers

Valve Size (in.):

2.000 intake / 1.550 exhaust

Fuel and Ignition

Ignition Timing:

36° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Premium pump

Show Less

Locate a Dealer

Tech Specs

Performance

Horsepower:

450 hp @ 5,800 rpm

Torque:

436 lb.-ft. @ 4,800 rpm

Max Rec RPM:

6,000

Engine Basics

Part Number:

19433046

Engine Type:

Chevy Small-Block V-8

Displacement:

383 cu. in. (6.3L)

Block:

Cast iron with 4-bolt main caps

Balanced:

External

Measurements

Bore x Stroke:

4.005 in. x 3.800 in.

Valve Lift (in):

.509 intake / .528 exhaust

Camshaft Duration (@.050 in):

220° intake / 230° exhaust

Compression Ratio:

9.9:1 (nominal)

Rocker Arm Ratio:

1.5:1

Internal Components

Crankshaft:

Forged steel

Connecting Rods:

Heavy-duty forged steel

Pistons:

Hypereutectic aluminum

Camshaft Type:

Steel hydraulic roller

Rocker Arms:

Aluminum roller style

Cylinder Head and Valves

Cylinder Heads:

Fast Burn aluminum; 62cc chambers

Valve Size (in.):

2.000 intake / 1.550 exhaust

Fuel and Ignition

Ignition Timing:

36° Total @ 4,000 rpm

Flexplate:

12.750”

Recommended Fuel:

Premium pump

#/#

View in 2025 Catalog