ATK GM 350 Vortec 290 HP HP99C Stage 3 Long Block
ATK GM 350 Vortec 290 HP HP99C Stage 3 Long Block provides track-validated Vortec performance featuring a complete carbureted setup and rugged cast iron heads for street builds.
- Performance Output: Proven 290 Horsepower.
- Engine Displacement: 5.7L / 350 CI.
- Cylinder Head Material: Cast Iron.
- Engine Block Material: Cast Iron.
- Dress Level: Complete Stage 3 Carbureted.
One Year Limited Warranty Included.
Description
ATK GM 350 Vortec 290 HP HP99C Performance Powertrain Engineering
ATK GM 350 Vortec 290 HP HP99C Stage 3 Long Block engines deliver complete powertrain engineering for enthusiasts seeking a reliable Vortec-based 350ci solution. This 5.7L powerplant features cast-iron Vortec cylinder heads and a seasoned cast-iron block to achieve a verified 290 horsepower and 9.4:1 compression ratio. Built with a hydraulic roller camshaft and a precision-balanced rotating assembly, this crate engine is optimized for consistent torque and long-term durability in truck and SUV applications.
Designed for streamlined installation, this street-ready crate motor arrives with a carbureted intake manifold, carburetor, and HEI distributor. While the ATK HP99C includes essential components like the water pump and harmonic balancer, builders will need to provide their own throttle body, flywheel, and air cleaner. The modern one-piece rear main seal effectively eliminates fluid weeping, making this Stage 3 configuration an ideal, ready-to-run solution for classic Vortec engine swaps.
Key Features of ATK High Performance HP99C
- 5.7L 350ci displacement with 290 horsepower output.
- Cast iron Vortec heads optimize airflow for consistent power.
- Hydraulic roller camshaft for stable and quiet valvetrain operation.
- 9.4:1 compression ratio designed for daily drivability.
- Seasoned cast-iron block foundation for structural integrity.
- One-piece rear main seal prevents common fluid leaks.
- Complete Stage 3 build reduces induction matching complexity.
HP99C Include:
- Intake Manifold
- Carburetor
- Distributor
- Oil Pan
- Valve Covers
- Timing Cover
- Water Pump
- Harmonic Balancer
- Flexplate
- Spark Plugs
- Spark Plug Wires
ATK High Performance HP99C GM 350 Vortec 290 HP Stage 3 Long Block Specs
| Brand | ATK High Performance Engines |
| Part Type | Crate Engines |
| Product Line | ATK High Performance GM 350 Vortec 290 HP Stage 3 Long Block Crate Engines |
| UPC | 00653517524943 |
| Crate Engine Family | Chevy Small Block |
| Actual Engine Displacement | 5.7L / 350 CI |
| Crate Engine Cylinder Head Material | Cast iron |
| Engine Block Material | Cast iron |
| Advertised Compression Ratio | 9.4:1 |
| Assembled | Yes |
| Engine Balance | Internal/External |
| Cam Style | Hydraulic roller, OE roller |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | Yes |
| Intake Manifold Style | Carbureted |
| Cylinder Heads Included | Yes |
| Carburetor Included | Yes |
| Throttle Body Included | No |
| Distributor Included | Yes |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | Yes |
| Spark Plug Wires Included | Yes |
| Computer Included | No |
| Wiring Harness Included | No |
| Water Pump Style | Long |
| Supercharger Included | No |
| Warranty Info | 1 Year |
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