ATK HP36C-EFI 383 Stroker Crate Engine – 435 HP / 475 TQ EFI

The Ultimate 383 Stroker Crate Engine with Self-Learning EFI

The ATK HP36C-EFI 383 stroker crate engine delivers turn-key performance with the convenience of self-learning EFI in a complete Stage 3 package that’s ready to drop into your classic Chevy, hot rod, or truck build. As part of our extensive Small Block Chevy collection, this 383 cubic inch stroker V8 produces an impressive 435 horsepower and 475 lb-ft of torque—while the FiTech Self-Learning EFI system provides trouble-free cold starts and optimal drivability regardless of elevation, driving habits, or modifications.

Whether you’re building a weekend cruiser, a street machine, or a show-winning classic, this ATK 383 stroker delivers the power, reliability, and modern drivability that Chevy enthusiasts demand.

What Makes the ATK 383 Stroker with EFI a Complete Turn-Key Package?

The ATK HP36C-EFI is engineered for enthusiasts who want maximum performance with modern drivability. Built on a seasoned 1996-2000 GM roller block with a 4-bolt main and 1-piece rear main seal, this 383 stroker combines a Scat forged rotating assembly with Dart SHP aluminum cylinder heads for exceptional durability and power.

The standout feature is the FiTech Go EFI 4 600 HP system—a self-learning electronic fuel injection system that eliminates the need for tuning regardless of elevation or modifications. The engine comes complete from throttle body down to the oil pan. All you need to supply is the fuel system—in-line, in-tank, or the FiTech Fuel Command Center.

383 Stroker Horsepower and Torque Figures

This 383 crate engine produces impressive output:

• 435 horsepower – dyno tested and verified

• 475 lb-ft torque – massive low-end and mid-range grunt

• 10.0:1 compression ratio – pump gas friendly

• Hydraulic roller cam – low maintenance, excellent durability

Complete 383 Stroker EFI Engine Specifications

Seasoned GM Block and Rotating Assembly

The foundation of this ATK 383 stroker is a seasoned 1996-2000 GM roller block featuring:

• 4-bolt main caps for exceptional bottom-end strength

• 1-piece rear main seal for leak-free operation

• 4.040-inch bore x 3.750-inch stroke

• External rear balance / internal front balance

• Scat nodular iron crankshaft for durability

• Scat 4340 forged I-beam connecting rods with ARP 8740 bolts

• Forged pistons with moly rings

• 10.0:1 compression ratio

Dart SHP Aluminum Cylinder Heads

The Dart SHP aluminum cylinder heads provide exceptional flow:

Hydraulic Roller Camshaft Specifications

FiTech Go EFI 4 System

The FiTech Go EFI 4 600 HP system includes:

• Throttle body with integrated fuel injection

• Wire harness for plug-and-play installation

• Handheld unit for monitoring and adjustments

• Self-learning technology – no tuning required

What’s Included with Your HP36C-EFI Crate Engine

The HP36C-EFI comes as a fully dressed long block with the following components included:

Important Note: Fuel pump is not provided – must run electric pump or mechanical fuel pump with FiTech Fuel Command Center.

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your ATK HP36C-EFI crate engine, review these critical notes:

• Oil pan compatibility: Rear sump 5qt oil pan is NOT compatible with Chevelles with steering behind the crossmember, some Corvettes, and 1962-1967 Chevy IIs

• Octane requirement: 91+ premium fuel recommended

• Exhaust: 1-5/8″ headers recommended

• Stall converter: 2200-2800 RPM recommended for automatic transmission

• Flexplate: External balance required (with Scat kit)

• Balancer: Internal balance required

• Spark plug gap: .035″

• Total timing: 34-36 degrees

• Firing order: 1-8-4-3-6-5-7-2

Fuel System Requirements

The FiTech EFI system requires a fuel supply. ATK recommends using either:

• An electric fuel pump (in-line or in-tank)

• The FiTech Fuel Command Center (a self-contained fuel reservoir system)

Break-In Procedure

ATK recommends the following break-in procedure:

• Use conventional (non-synthetic) 10W30 oil with zinc additive for the first 500 miles

• Do not drive for long periods at any single speed – vary your speed

• Do not tow a trailer or put heavy loads on the vehicle

• Check engine oil and coolant levels daily

• At 500 miles, change oil and filter using conventional (non-synthetic) oil

• After the first 5,000 miles of service, synthetic engine oil may be used

Core Return Information

A core charge applies on this engine. Core return can be any Small Block Chevy 350ci engine, except 1992-1997 LT1-style engines.

Emissions Compliance

This product is not for use in pollution-controlled vehicles. This is a race-only product that is to be used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization.

Warranty

ATK High Performance backs the HP36C-EFI with a 2-year / unlimited mileage warranty.

ATK HP36C-EFI Engine FAQs

What vehicles is the HP36C-EFI compatible with?

The HP36C-EFI is a direct replacement for any vehicle originally equipped with a small-block Chevy, including 1967-1992 Chevelles, Camaros, Novas, Corvettes, and trucks. Note the oil pan compatibility restrictions: not for Chevelles with steering behind crossmember, some Corvettes, and 1962-1967 Chevy IIs.

What’s included with the HP36C-EFI?

The HP36C-EFI is a fully dressed long block assembly including the seasoned GM block, Dart SHP aluminum heads, forged rotating assembly, hydraulic roller cam, FiTech EFI system, intake manifold, HEI distributor, water pump, damper, flexplate, oil pan, valve covers, spark plugs, and wires.

What fuel does the HP36C-EFI require?

91+ octane premium fuel is recommended for optimal performance.

Does the HP36C-EFI include a fuel pump?

No. The fuel pump is not provided – you must run an electric pump or mechanical pump with the FiTech Fuel Command Center.

What is the warranty on ATK engines?

ATK High Performance engines are backed by a 2-year / unlimited mileage warranty.

What is the difference between HP36C and HP36C-EFI?

The HP36C is a Stage 3 engine with a carburetor. The HP36C-EFI is the same Stage 3 engine but with the FiTech Self-Learning EFI system instead of a carburetor.