Product Description
The ATK HP101M Chevrolet 383ci High-Performance Stroker Mid-Dress Crate Engine is a powerful, professionally assembled V8 engine designed for classic Chevrolet restorations, muscle-car projects, performance engine replacements, and compatible custom automotive builds.
Delivering an impressive 460 horsepower and 490 lb-ft of torque, this high-performance engine combines the proven Chevrolet small-block platform with increased 383 cubic-inch displacement, forged pistons, SCAT rotating components, aluminum cylinder heads, and a performance hydraulic roller camshaft.
Built around a 1996–2000 Chevrolet OE roller engine block, the HP101M features four-bolt main construction and a one-piece rear main seal. Its 4.040-inch bore and 3.750-inch stroke produce the increased displacement associated with Chevrolet 383 stroker engines.
The engine’s rotating assembly features a SCAT nodular iron crankshaft, 5.7-inch SCAT I-beam connecting rods with ARP 8740 bolts, forged pistons, and moly piston rings.
These components are combined with a 10.0:1 compression ratio and performance valvetrain components to achieve the engine’s advertised power output.
A major feature of the ATK HP101M is its aluminum cylinder head configuration, commonly specified with Dart SHP performance heads featuring 72cc combustion chambers, 200cc intake runners, 2.020-inch intake valves, and 1.600-inch exhaust valves.
The engine uses a hydraulic roller camshaft featuring 224° intake and 236° exhaust duration at .050-inch lift, with .591-inch advertised valve lift and a 108° lobe separation angle.
Unlike the ATK HP101 base engine, which is supplied as a more basic assembled long block, the HP101M Mid-Dress Engine includes additional external components to provide a more complete engine assembly.
Its mid-dress configuration includes an intake manifold, distributor, harmonic balancer, water pump, timing cover, oil pan, and valve covers.
This makes the HP101M attractive to customers seeking a performance engine with several major external components already selected while retaining flexibility to choose compatible fuel-delivery and other finishing equipment.
The engine is particularly suitable for professionally planned classic Chevrolet muscle-car restorations, custom street-car projects, classic pickup builds, and other compatible automotive applications.
Whether replacing an existing small-block Chevrolet engine or developing a custom drivetrain, the ATK HP101M 383 Stroker Mid-Dress Crate Engine provides an assembled performance foundation with substantial power output, high-quality internal components, and a comprehensive mid-dress package.
Key Features
460 Horsepower Performance
Produces an advertised 460HP for compatible Chevrolet small-block automotive applications.
490 lb-ft of Torque
Delivers 490 lb-ft of torque from its 383 cubic-inch stroker configuration.
383ci Chevrolet Small Block V8
Features the traditional Chevrolet small-block architecture with increased stroker displacement.
Four-Bolt Main Engine Block
Built around an OE roller block with four-bolt main construction and a one-piece rear main seal.
SCAT Performance Rotating Assembly
Incorporates a SCAT nodular iron crankshaft and 5.7-inch SCAT I-beam connecting rods.
Forged Performance Pistons
Features forged pistons with moly piston rings.
Performance Aluminum Cylinder Heads
Commonly specified with Dart SHP aluminum heads, 72cc combustion chambers, and 200cc intake runners.
Hydraulic Roller Camshaft
Includes a performance-oriented hydraulic roller camshaft with .591-inch advertised valve lift.
Billet Aluminum Roller Rockers
Features 1.6-ratio billet aluminum roller rocker arms.
Complete Mid-Dress Configuration
Includes the assembled engine with an intake manifold, distributor, water pump, harmonic balancer, and other engine-mounted components.
Double-Roller Timing Chain
Equipped with a double-roller timing set.
Two-Year Limited Warranty
Supported by a published two-year limited warranty, subject to applicable supplier and manufacturer conditions.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | ATK High Performance Engines |
| Manufacturer Part Number | HP101M |
| GTIN / UPC | 653517517785 |
| Store SKU | ATK-HP101M-383V8-2226 |
| Engine Category | Mid-Dress Performance Crate Engine |
| Engine Family | Chevrolet Small Block V8 |
| Displacement | 383ci / 6.3L |
| Cylinder Configuration | V8 |
| Advertised Horsepower | 460 HP |
| Advertised Torque | 490 lb-ft |
| Engine Block | 1996–2000 OE Roller Block |
| Block Material | Cast Iron |
| Main Bearing Configuration | 4-Bolt Main |
| Rear Main Seal | One-Piece |
| Bore | 4.040 Inches |
| Stroke | 3.750 Inches |
| Compression Ratio | 10.0:1 |
| Crankshaft | SCAT Nodular Iron |
| Crankshaft Balance | Internal Front / External Rear |
| Connecting Rods | SCAT I-Beam |
| Connecting Rod Length | 5.7 Inches |
| Connecting Rod Bolts | ARP 8740 |
| Pistons | Forged |
| Piston Rings | Moly |
| Camshaft Type | Hydraulic Roller |
| Intake Cam Duration @ .050 | 224° |
| Exhaust Cam Duration @ .050 | 236° |
| Advertised Valve Lift | .591″ Intake / .591″ Exhaust |
| Lobe Separation Angle | 108° |
| Timing Chain | Double Roller |
| Cylinder Head Material | Aluminum |
| Commonly Specified Cylinder Heads | Dart SHP |
| Combustion Chamber Volume | 72cc |
| Intake Runner Volume | 200cc |
| Intake Valve Diameter | 2.020 Inches |
| Exhaust Valve Diameter | 1.600 Inches |
| Rocker Arms | Billet Aluminum Roller |
| Rocker Ratio | 1.6:1 |
| Oil Pan | Rear Sump |
| Oil Pan Capacity | 5 Quarts |
| Oil Pump | Melling Standard Volume |
| Intake Manifold | Included |
| Distributor | Included |
| Water Pump | Included |
| Harmonic Balancer | Included |
| Carburetor | Not Included |
| Fuel Pump | Not Included |
| Recommended Fuel | 91+ Octane Gasoline |
| Warranty | 2-Year Limited Manufacturer Warranty |
The published detailed engine specifications support the 460HP and 490 lb-ft figures. Some retailer pages contain inconsistent secondary specification fields, so the manufacturer’s build sheet should govern final component identification.
Engine Block / Internal Configuration
| Component | Details |
|---|---|
| Engine Architecture | Chevrolet Small Block V8 |
| Displacement | 383 Cubic Inches |
| Engine Block | OE Roller Block |
| Block Years | 1996–2000 |
| Main Configuration | 4-Bolt Main |
| Rear Main Seal | One-Piece |
| Bore × Stroke | 4.040″ × 3.750″ |
| Crankshaft | SCAT Nodular Iron |
| Connecting Rods | SCAT I-Beam |
| Connecting Rod Length | 5.7 Inches |
| Rod Bolts | ARP 8740 |
| Pistons | Forged |
| Compression Ratio | 10.0:1 |
| Piston Rings | Moly |
| Timing Assembly | Double-Roller Timing Chain |
The HP101M combines Chevrolet small-block architecture with an upgraded rotating assembly and increased stroker displacement, providing a substantial performance foundation for compatible automotive applications.
Cylinder Head / Valvetrain Configuration
| Component | Details |
|---|---|
| Cylinder Head Material | Aluminum |
| Commonly Specified Head | Dart SHP |
| Combustion Chamber | 72cc |
| Intake Runner | 200cc |
| Intake Valve Size | 2.020 Inches |
| Exhaust Valve Size | 1.600 Inches |
| Camshaft Type | Hydraulic Roller |
| Intake Duration @ .050 | 224° |
| Exhaust Duration @ .050 | 236° |
| Intake Valve Lift | .591 Inches |
| Exhaust Valve Lift | .591 Inches |
| Lobe Separation | 108° |
| Rocker Arms | Billet Aluminum Roller |
| Rocker Ratio | 1.6:1 |
| Timing Chain | Double Roller |
The aluminum cylinder heads and hydraulic roller valvetrain are designed to support the engine’s advertised high-performance output.
Fuel / Intake Configuration
| Component | Details |
|---|---|
| Fuel Type | Gasoline |
| Recommended Fuel | Premium 91+ Octane |
| Intake Manifold | Included |
| Intake Configuration | Dual Plane |
| Carburetor | Not Included |
| Fuel Pump | Not Included |
| Fuel Delivery | Carbureted Configuration |
| Air Cleaner | Not Included |
| Intended Application | Compatible Performance Engine Projects |
The mid-dress engine includes an intake manifold, while the remaining fuel-delivery components must be selected separately.
Ignition / Electrical Configuration
| Component | Details |
|---|---|
| Distributor | Included in Mid-Dress Configuration |
| Distributor Type | HEI Configuration |
| Distributor Gear | Iron |
| Spark Plugs | Confirm Supplied Package |
| Spark Plug Wires | Not Included |
| Wiring Harness | Not Included |
| Engine Computer | Not Included |
| Electrical Compatibility | Vehicle-Specific |
Cooling / Lubrication Configuration
| Component | Details |
|---|---|
| Water Pump | Included |
| Water Pump Configuration | OE Long Pump |
| Oil Pump | Melling Standard Volume |
| Oil Pan | Rear Sump |
| Oil Pan Capacity | 5 Quarts |
| Timing Cover | Included |
| Valve Covers | Included |
| Radiator | Not Included |
| External Cooling Components | Vehicle-Specific |
Engine Balance / Drivetrain Configuration
| Component | Details |
|---|---|
| Crankshaft Front Balance | Internal |
| Crankshaft Rear Balance | External |
| Harmonic Balancer | Included |
| Referenced Balancer | PowerBond PB1046-N |
| Referenced Flexplate | Pioneer FRA-159 |
| Flywheel | Not Included |
| Transmission | Not Included |
| Drivetrain Compatibility | Application-Specific |
| Rear Main Seal | One-Piece |
Mid-Dress Engine / Package Configuration
| Component | Details |
|---|---|
| Engine Package | Mid-Dress |
| Assembled Short Block | Included |
| Cylinder Heads | Installed |
| Hydraulic Roller Camshaft | Installed |
| Valvetrain | Installed |
| Timing Set | Included |
| Intake Manifold | Included |
| Distributor | Included |
| Water Pump | Included |
| Harmonic Balancer | Included |
| Oil Pan | Included |
| Oil Pump | Included |
| Valve Covers | Included |
| Timing Cover | Included |
| Carburetor | Not Included |
| Fuel Pump | Not Included |
| Spark Plug Wires | Not Included |
What’s Included
| Included Component | Details |
|---|---|
| ATK HP101M Chevrolet 383ci Mid-Dress Engine | 1 Unit |
| Four-Bolt Main Cast-Iron Engine Block | Included |
| SCAT Nodular Iron Crankshaft | Installed |
| SCAT I-Beam Connecting Rods | Installed |
| Forged Pistons | Installed |
| Moly Piston Rings | Installed |
| Hydraulic Roller Camshaft | Installed |
| Double-Roller Timing Chain | Installed |
| Performance Aluminum Cylinder Heads | Installed |
| Roller Rocker Arms | Installed |
| Intake Manifold | Included |
| Distributor | Included |
| Harmonic Balancer | Included |
| Water Pump | Included |
| Timing Cover | Included |
| Valve Covers | Included |
| Rear-Sump Oil Pan | Included |
| Oil Pump | Included |
| Carburetor | Not Included |
| Fuel Pump | Not Included |
| Spark Plug Wires | Not Included |
| Transmission | Not Included |
| Flywheel | Not Included |
Published listings conflict over whether the flexplate is physically included. The table above does not promise a flexplate; verify the exact supplier package before publication.
Vehicle / Installation Compatibility
The ATK HP101M Chevy 383 Stroker Engine is intended for compatible Chevrolet small-block V8 applications.
| Vehicle Application | Compatibility Considerations |
|---|---|
| Classic Chevrolet Camaro | Engine Mounting and Drivetrain Compatibility |
| Chevrolet Chevelle | Oil Pan and Steering Clearance |
| Chevrolet Nova | Engine Bay and Chassis Fitment |
| Chevrolet Impala | Engine and Transmission Compatibility |
| Chevrolet El Camino | Mounting and Cooling Requirements |
| Classic Chevrolet Trucks | Engine Mounting and Accessory Clearance |
| Compatible GMC Trucks | Small-Block Chevrolet Drivetrain Requirements |
| Custom Automotive Projects | Complete Vehicle-Specific Verification |
The rear-sump oil pan may not fit some Chevelle and Corvette configurations or 1962–1967 Chevrolet Chevy II vehicles.
Ideal Applications
Classic Chevrolet Restoration
An option for compatible Chevrolet restoration projects requiring a professionally assembled, high-performance small-block V8.
Muscle-Car Projects
Provides a 383ci stroker engine foundation for appropriately configured classic muscle-car applications.
Custom Automotive Builds
The mid-dress package allows professional automotive builders to integrate an assembled engine with suitable vehicle-specific components.
Classic Truck Restoration
Suitable for selected classic Chevrolet and GMC truck projects where engine and drivetrain compatibility have been established.
Professional Automotive Workshops
Offers an assembled performance engine for workshops specializing in engine replacement and restoration projects.
Product Advantages
The ATK HP101M 383 Stroker Mid-Dress Engine combines strong advertised performance output, forged pistons, SCAT rotating components, aluminum cylinder heads, and a hydraulic roller camshaft.
Its 460HP and 490 lb-ft torque ratings position it as a higher-output option within the Chevrolet small-block stroker engine category.
Compared with the HP101 base-engine package, the HP101M mid-dress configuration also includes major external engine components such as the intake manifold, distributor, water pump, and harmonic balancer.
This makes it a convenient option for customers seeking a more complete assembled engine without purchasing a fully dressed configuration.
Safety & Installation Notice
Professional automotive installation is recommended. Confirm mounting compatibility, cooling, transmission, fuel-system requirements, and applicable emissions regulations before purchase.
Important: This engine’s performance camshaft produces limited idle vacuum. It may not supply sufficient vacuum for conventional vacuum-assisted power brakes without a properly engineered supplementary system.
The HP101M should not be assumed emissions-legal for all street-driven vehicles.
Warranty Information
2-Year Limited Manufacturer Warranty
Published major auto-parts retailer information identifies a two-year limited warranty for HP101M. Coverage remains subject to the applicable manufacturer’s or supplier’s written terms, exclusions, and eligibility requirements.
Product Highlights
-
ATK HP101M Chevrolet 383 Stroker Mid-Dress Crate Engine
-
460 Horsepower & 490 lb-ft Torque
-
383ci / 6.3L Small Block V8
-
Four-Bolt Main OE Roller Block
-
SCAT Nodular Iron Crankshaft
-
SCAT 5.7-Inch I-Beam Connecting Rods
-
Forged Pistons & Moly Rings
-
10.0:1 Compression Ratio
-
Performance Aluminum Cylinder Heads
-
Hydraulic Roller Camshaft
-
Billet Aluminum Roller Rockers
-
Double-Roller Timing Chain
-
Intake Manifold Included
-
Distributor Included
-
Water Pump & Harmonic Balancer Included
-
Mid-Dress Engine Configuration
-
2-Year Limited Manufacturer Warranty
Reviews
There are no reviews yet.