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A Black and White Checkered Flag Against a Yellow Background in a Circle

Parts intended for competition use only*
A Yellow Triangle with an Exclamation Point in the Center

Proposition 65 Warning*
A Chevrolet Performance Parts 383 Crate Engine

Classic Small-Block Strokers

Classic Small-Block Strokers
Locate a Dealer
A Black and White Checkered Flag Against a Yellow Background in a Circle

Parts intended for competition use only*
A Yellow Triangle with an Exclamation Point in the Center

Proposition 65 Warning*
A Yellow Horsepower Icon

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*
A Yellow Speedometer Icon

Up to

6,000

Max Recommended RPM
A Yellow Displacement Icon

Up to

383 cu. in. (6.3L)

Displacement

383 Engines

  • HT383

    Serious pulling power for the non-stock truck rebuild.
    Chevrolet Performance HT383 Crate Engine

    View HT383

    Serious pulling power for the non-stock truck rebuild. 
    fpo

    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.
    A Chevy Performance Parts HT383 Small-Block Crate Engine

    View HT383E

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

    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.
    A Chevy Performance Parts SP383 Small-Block Crate Engine

    View SP383 Turnkey

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

    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.
    A Chevy Performance Parts SP383 EFI Small-Block Crate Engine

    View SP383 EFI Turnkey

    Classic performance paired with Fast Burn cylinder heads and EFI.
    fpo

    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