ATK HP94C-EFI 383 Stroker Crate Engine – 415 HP / 460 TQ EFI

The Ultimate 383 Stroker Crate Engine with Self-Learning EFI

The ATK HP94C-EFI 383 stroker crate engine delivers turn-key performance with the convenience of self-learning EFI in a complete 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 415 horsepower and 460 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 HP94C-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 ATK High Performance 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 .

383 Stroker Horsepower and Torque Figures

This 383 crate engine produces impressive output:

• 415 horsepower – dyno tested and verified 

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

• 9.7:1 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

• Internal front / external rear engine balance

• Scat nodular iron crankshaft for durability

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

• Hypereutectic pistons with moly rings

• 9.7:1 compression ratio

ATK High Performance Aluminum Cylinder Heads

The ATK aluminum cylinder heads provide exceptional flow :

• 64cc combustion chambers

• 195cc intake runners

• 2.020-inch intake valves

• 1.600-inch exhaust valves

• Billet aluminum 1.6:1 ratio roller rocker arms

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 HP94C-EFI Crate Engine

The HP94C-EFI comes as a fully dressed long block with the following components included :

Important Note: The following components are not included and must be sourced separately :

• Electric fuel pump or FiTech Fuel Command Center

• Fuel lines

• Air cleaner

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your ATK HP94C-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 (Pioneer #FRA-159 included) 

• Balancer: Internal balance required (PowerBond #PB1046-N included) 

• 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 break-in oil or conventional 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

• Avoid long periods of idling during this period

• Check engine oil and coolant levels daily

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

Core Return Information

A core charge of approximately $510.00 applies . Core return can be any small-block Chevy 350ci engine, except 1992-1997 LT1-style engines .

ATK HP94C-EFI Engine FAQs

What vehicles is the HP94C-EFI compatible with?

The HP94C-EFI is a direct replacement for any vehicle originally equipped with a small-block Chevy, including :

• 1971 C10

• 1975 Corvette

• 1979 Camaro

• 1982 Cutlass

• 1992 Roadmaster

How much does the ATK HP94C-EFI crate engine cost?

The ATK HP94C-EFI is priced at approximately $6,098.99 . A core charge applies. Contact NH Race Engine for current European pricing and availability.

What’s included with the HP94C-EFI?

The HP94C-EFI is a fully dressed long block assembly including the seasoned GM block, ATK aluminum heads, forged rotating assembly, hydraulic roller cam, oil pan, valve covers, timing cover, oil pump, FiTech EFI system, intake manifold, HEI distributor, water pump, damper, flexplate, spark plugs, and wires .

What fuel does the HP94C-EFI require?

91+ octane premium fuel is recommended for optimal performance .

What is the warranty on ATK engines?

ATK High Performance engines are backed by a 24-month / unlimited mileage warranty .

What is the difference between HP94C and HP94C-EFI?

The HP94C is a Stage 3 engine with a carburetor . The HP94C-EFI is the same Stage 3 engine but with the FiTech Self-Learning EFI system instead of a carburetor .

Why Choose NH Race Engine for Your SBC Crate Engine?

As a Netherlands-based specialist serving performance enthusiasts across Europe, NH Race Engine brings unmatched expertise to your small-block Chevy project. We understand the unique requirements of European builds—from shipping logistics to regional considerations. Browse our Small Block Chevy collection and other crate engine offerings to find the perfect solution for your build.

Order Your ATK HP94C-EFI Crate Engine from NH Race Engine Today

The ATK HP94C-EFI 383 stroker crate engine delivers exceptional value with its combination of forged internals, ATK aluminum heads, and self-learning FiTech EFI. With ATK’s hand-built quality and NH Race Engine’s European distribution network, you can trust that your replacement engine delivers the quality and reliability you demand.

Contact NH Race Engine today to discuss your HP94C-EFI engine requirements. Our expert team can help you navigate compatibility, shipping, and installation considerations for your European build.

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