ATK HP94C-EFI High Performance GM 383 Stroker — 415 HP Stage 3 EFI Crate Engine with FiTech

The smartest turn-key EFI crate engine in the small-block Chevy world. The ATK HP94C-EFI pairs America’s favorite stroker — the 383 — with self-learning FiTech fuel injection on a fully dressed Stage 3 engine: 415 HP and 460 TQ on 91–93 octane, aluminum heads, hydraulic roller cam, and everything from intake to oil pan already installed. No carburetor tuning, no cold-start drama, no altitude re-jetting — just modern drivability with classic Chevy character. Dyno sheets have shown these engines making 420+ HP. Crated and shipped fast across Europe from NH Race Engine.

Why Choose the ATK HP94C-EFI EFI Crate Engine?

Carburetors are charming until the first cold morning, the first mountain pass, or the first summer traffic jam. The HP94C-EFI solves the classic problem of putting modern drivability in a classic car: ATK designed this engine specifically for better drivability and trouble-free cold starts, and the FiTech system self-tunes as you drive — no laptop, no dyno time, no tuner required. Bolt it in, add fuel pressure, and drive.

Under the EFI, this is the full Stage 3 383 recipe: a seasoned 1996–2000 OE roller block with four-bolt mains and a 1-piece rear seal, a Scat nodular-iron crank, 5.7″ rods with ARP 8740 bolts, ATK American-made aluminum heads (64cc chambers, 195cc runners) and a hydraulic roller cam (220°/224° @ .050) at 9.7:1 compression. The rotating assembly is over-built, the top end breathes like race hardware, and the whole package is balanced, assembled and dyno-validated by ATK’s performance division.

EFI Crate Engine Key Features & Benefits

• 415 HP / 460 TQ — Dyno-Proven: ATK’s conservative rating; dyno sheets have shown 420+ HP and 465+ TQ. Build documentation included.
• FiTech Self-Learning EFI: Continuously tunes fuel and timing as you drive — cold starts, altitude changes and weather are handled automatically. No laptop required.
• Fully Dressed: Intake manifold, FiTech EFI system, distributor, oil pan, valve covers, timing cover, water pump, harmonic balancer, flexplate, spark plugs and plug wires — installed and torqued at the factory.
• Scat Stroker Rotating Assembly: Nodular-iron 3.750″ stroke crank, 4.040″ bore, 5.7″ rods with ARP 8740 bolts — forged-grade hardware in an affordable package.
• ATK Aluminum Heads: American-made 64cc/195cc castings with 2.02″/1.60″ valves — race-bred flow, pump-gas friendly.
• Hydraulic Roller Cam: 220°/224° @ .050 — strong midrange torque, EFI-friendly vacuum, zero valve-lash maintenance.
• 9.7:1 on 91–93 Octane: European premium pump fuel compatible — no race gas, no additives.
• 4-Bolt Main OE Roller Block: 1996–2000 GM architecture with 1-piece rear main seal — the strongest factory foundation for stroker power.

EFI Crate Engine Recommended Applications

The HP94C-EFI is the fastest route to a running, driving fuel-injected classic:

• Restomods: Classic Chevelles, Camaros, Novas and trucks with modern EFI drivability — the #1 use case
• Daily-Driven Classics: Cold mornings, traffic and mountain passes handled automatically
• Street Rods & Customs: Clean engine bay, no carb tuning kit required
• First-Time Swappers: The most forgiving induction choice for builders new to EFI
• C10 & Square-Body Trucks: Work-truck reliability with 460 lb-ft of torque

You supply: fuel tank, in-tank or inline fuel pump (FiTech recommends 58+ PSI capable), fuel lines, battery, exhaust headers and your choice of transmission. Everything engine-side is in the crate.

Technical Specifications

What’s Included vs. What You Supply

HP33C vs HP94C vs HP94C-EFI — Which 383 Package?

Frequently Asked Questions

What does the FiTech system need to work?

Clean fuel pressure is everything: FiTech requires a pump capable of 58+ PSI — an in-tank pump or FiTech’s inline booster pump. Everything else (ECU, sensors, wiring) is included and installed on the engine.

Can the self-learning EFI really tune itself?

Yes — FiTech’s self-learning strategy adjusts fuel and timing tables based on oxygen sensor feedback as you drive. After a few varied trips, it’s dialed in. Base maps come pre-loaded for this exact cam and displacement, so it runs correctly from the first start.

Is an EFI crate engine harder to install than a carbureted one?

Actually easier — there’s no choke linkage, no fuel-bowl venting, no intake gasket coolant passages to worry about. You connect power, ground, fuel lines and the O2 sensor. Most builders complete the EFI side in an afternoon.

What’s the break-in procedure on the HP94C-EFI?

Same ATK spec as all HP engines: vary RPM (2,000–2,500) under load for the first 20 minutes, no extended idling, conventional oil for the first 500 miles, then oil and filter change. The EFI actually makes break-in easier — it maintains correct AFR automatically. Full instructions ship with the engine.

Can I run this in a car with a stock fuel tank?

Yes, with a compatible in-tank pump or FiTech’s inline system. Avoid drawing through a rusty original tank — clean or replace it first, and use a pre-filter. We stock EFI-ready tanks and pumps — see companion products.

Recommended Companion Products

• EFI fuel systems — tanks, 58+ PSI pumps, lines
• Headers & exhaust for small block Chevy
• Flywheels & flexplates — SBC balance
• 700R4/4L60E/TKO transmissions & converters
• Break-in oil & assembly lubricant
• Aluminum radiators & EFI-friendly cooling
• ATK HP33C — 383 stroker long block (carb-ready)
• VEGE DCH4 — Vortec 350 for factory-fit builds
• All crate engines — remanufactured & high performance

Shipping Your EFI Crate Engine Across Europe

NH Race Engine ships ATK EFI crate engine packages across Europe from our EU warehouse. Fully dressed engines ship crated on a pallet via insured freight carrier with full tracking — dyno sheets, FiTech instructions and build documentation included.

Estimated delivery: Netherlands 3–5 business days | Germany, Belgium, France 5–7 business days | Rest of EU 7–10 business days

Liftgate delivery available on request. Contact us for a freight quote to your address or workshop.

Order Your ATK HP94C-EFI EFI Crate Engine Today

Carburetor frustration ends here. The ATK HP94C-EFI EFI crate engine delivers 415 dyno-proven horsepower with self-learning fuel injection — the fastest, most drivable route to a classic Chevy with a modern heart.

Contact our technical team with your vehicle and build goals for a complete package quote, or click “Add to Cart” now to secure yours.

SKU: ATK-HP94C-EFI | MPN: HP94C-EFI | Brand: ATK High Performance Engines | Category: High Performance Crate Engines / EFI Crate Engines