ATK HP89CBLK GM 350 Stage 3 Long Block Crate Engine – Reliable 390 HP Powerhouse for Classic & Modern Swaps
The ATK HP89CBLK is a premium Stage 3 long block crate engine from ATK High Performance, delivering 390 horsepower and 420 ft-lbs of torque in a hand-assembled, balanced package. Built on a seasoned OE roller cam block (1996-2000 vintage), it features upgraded aluminum heads, a hydraulic roller cam, and performance internals for strong street manners with noticeable rumble—ideal for muscle cars, street rods, hot rods, trucks, and classic Chevy swaps. This carbureted long block (black finish) is dyno-tested for turn-key reliability and comes ready for your intake, carb, distributor, and accessories.
ATK HP89CBLK 350 crate engine – black long block with aluminum heads ready for installation
Key Features & Benefits
- 390 HP / 420 TQ Performance — Pump-gas friendly with a lopey idle that’s streetable yet aggressive—great power for daily driving or weekend fun.
- Upgraded Aluminum Heads — Likely Vortec-style or aftermarket aluminum (64cc chambers typical) for better flow, lighter weight, and improved cooling.
- Hydraulic Roller Cam — Smooth operation, reduced friction, and better longevity than flat tappet cams.
- Strong Bottom End — OE 4-bolt main roller block (1-piece rear seal) with overbored 4.040″ cylinders for durability under boost or high RPM.
- Hand-Assembled & Balanced — Each engine is meticulously built and balanced for vibration-free performance and long life.
- Black Finish — Attractive painted long block for show-quality looks.
Close-up of ATK HP89CBLK aluminum heads and roller cam setup – key to its 390 HP output
Technical Specifications
| Specification | Details |
|---|---|
| Engine Type | Chevrolet Small Block V8 (GM 350 ci / 5.7L) |
| Horsepower | 390 HP |
| Torque | 420 ft-lbs |
| Bore x Stroke | 4.040″ x 3.480″ |
| Compression Ratio | 10.0:1 (advertised) |
| Block | OE roller cam 4-bolt main, 1-piece seal (1996-2000 vintage) |
| Cylinder Heads | Aluminum (Vortec-style or equivalent, 64cc chambers) |
| Camshaft | Hydraulic roller |
| Crate Engine Type | Stage 3 Long Block (assembled, no intake/carb/distributor) |
| Fuel Requirement | Pump gas (91+ octane recommended) |
| Warranty | Manufacturer-backed (typically 24 months / unlimited mileage on select parts—confirm with Hammer Engines) |
Advantages Table: Why the ATK HP89CBLK Stands Out
| Feature | Benefit | Advantage for Your Build |
|---|---|---|
| 390 HP / 420 TQ Output | Strong street performance on pump gas | Instant power for muscle cars, rods, trucks |
| Aluminum Heads & Roller Cam | Better flow, lighter weight, reduced friction | Improved efficiency, cooler running, longer life |
| 4-Bolt Main Block | Robust bottom end | Handles high RPM, mild boost, or heavy use |
| Hand-Built & Balanced | Precision assembly | Smooth operation, minimal vibration, reliability |
| Stage 3 Long Block | Complete rotating assembly + heads | Faster install than base short blocks |
| Affordable High Performance | Competitive pricing (often $2,500–$3,500 range) | Great value vs. custom builds |
Why Choose the ATK HP89CBLK from Hammer Engines?
ATK Engines are known for quality remanufactured and performance crate motors with proven reliability in real-world swaps (e.g., C3 Corvettes, classic Chevys, trucks). The HP89CBLK offers a noticeable cam lope for that classic muscle sound while remaining drivable. It’s carbureted for simplicity (EFI variants available like HP89C-EFI). Hammer Engines stocks genuine ATK units with expert compatibility checks for your vehicle—whether it’s a 1969 Corvette, ’80s truck swap, or hot rod project.
Ideal Applications & Compatibility
- Muscle Cars & Classics — 1960s–1980s Chevys, Camaros, Novas, Chevelles.
- Street Rods & Hot Rods — Turn-key power for custom builds.
- Trucks & 4x4s — Strong torque for towing or off-road fun.
- Engine Swaps — Direct fit for many GM small-block applications (may require minor mods for mounts, accessories).
- Mild Performance Builds — Pump-gas friendly; add headers/intake for even more gains.
ATK High Performance GM 350 390 HP Stage 3 Long Block Crate Engines
Awesome performance and awesome looks collide with ATK High Performance GM 350 390 hp Stage 3 long block crate engines. They are topped with trick looking parts and have the power to back them up. Each engine is hand-assembled and balanced to help them put out 390 hp and 420 ft.-lbs. of torque that will tear up the street or strip. Whether you are looking to pack some more power in your street rod, muscle car, or truck, ATK has you covered!
ATK GM 350 390 hp Stage 3 long block crate engines include:
* Handpicked, remanufactured block
* ATK High Performance aluminum cylinder heads with 2.020 in. /1.600 ex. valves
* Intake manifold
* Carburetion
* OE crankshaft and connecting rods
* Hypereutectic pistons
* Hydraulic roller camshaft
* Cam lift- .528 int./.536 exh.
* Cam duration at 0.50- 220 int./224 exh.
* 10.0:1 compression
* Distributor, plug wires, and plugs
* Valve covers
* Timing cover and timing set
* Oil pan, pump, and pickup tube
* Water pump
* Front damper and flexplate
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