Buy GM 350 Vortec 290 HP Stage 3 Long Block Crate Engines Online
Upgrade your vehicle with the ATK High Performance GM 350 Vortec 290 HP Stage 3 Long Block Crate Engine (HP99C), a dependable replacement engine engineered for reliable street performance and long-lasting durability. Built around the legendary 5.7L Chevy Small Block platform, this Stage 3 long block produces 290 horsepower and features 300 yamaha outboard premium vortec 350 engine matched components for smooth operation and consistent power delivery. It includes durable cast iron Vortec cylinder heads, a hydraulic roller camshaft, hypereutectic vortec 350 motor pistons with a 9.4:1 compression ratio, and a dual-plane intake manifold for enhanced throttle response and everyday drivability.
The HP99C comes extensively assembled with essential components, including the intake manifold, carburetor, HEI distributor, oil pan, valve covers, water 350 vortec motor pump, harmonic balancer, flexplate, spark plugs, and ignition wires, helping reduce installation time and simplifying your engine swap project. Designed for restoration projects, classic trucks, muscle cars, and performance vortec 350 engine for sale street builds, this crate engine delivers an ideal combination of factory reliability and upgraded performance. Please note that this engine requires an electric fuel pump, as it does not include provisions for a mechanical fuel pump. Whether you’re replacing a worn-out engine or building a dependable performance vehicle, the ATK HP99C offers an excellent balance of power, quality, and value.
Product Specifications: GM 350 Vortec 290 HP Stage 3 Long Block Crate Engines
- Brand: ATK High Performance
- Part Number: HP99C
- Engine Type: Stage 3 Long Block Crate Engine
- Engine Family: GM Small Block Chevy 350 Vortec
- Displacement: 350 CID (5.7L)
- Horsepower: 290 HP
- Torque: 375 lb-ft
- Compression Ratio: 9.4:1
- Block Material: OE Cast Iron Roller Block
- Main Caps: 2-Bolt Main
- Rear Main Seal: One-Piece
- Crankshaft: OE Reground Steel
- Connecting Rods: OE Powder Metal, 5.7 in.
- Pistons: Hypereutectic Aluminum
- Piston Rings: Moly Rings
- Camshaft Type: Hydraulic Roller
- Timing Chain: Single Roller
- Cylinder Heads: Vortec Cast Iron, 64cc Chambers
- Valve Size: 1.94″ Intake / 1.50″ Exhaust
- Rocker Arms: Stamped Steel, 1.5 Ratio
- Intake Manifold: ATK Dual-Plane Intake
- Carburetor: Quick Fuel Brawler 670 CFM with Electric Choke
- Distributor: HEI Distributor
- Water Pump: OE Long Water Pump
- Oil Pump: Melling Standard Volume
- Oil Pan: 5-Quart Rear Sump
- Fuel Pump Requirement: External Electric Fuel Pump Required (No Mechanical Fuel Pump Provision)
- Recommended Fuel: 91+ Octane
- Recommended Oil: Conventional 10W-30
- Spark Plug Gap: 0.035 in.
- Firing Order: 1-8-4-3-6-5-7-2
Key Benefits
- Delivers a strong 290 horsepower and 375 lb-ft of torque for dependable street performance.
- Built with premium internal components for enhanced durability and long engine life.
- Hydraulic roller camshaft provides smooth idle, excellent throttle response, and reliable performance.
- Vortec cast iron cylinder heads improve airflow and combustion efficiency.
- Comes largely pre-assembled with the intake manifold, carburetor, distributor, water pump, oil pan, and valve covers to simplify installation.
- Ideal for classic Chevy restorations, muscle cars, street rods, trucks, and custom performance builds.
- Factory-tested components help ensure dependable operation and consistent power output.
- Hypereutectic pistons and moly rings provide excellent wear resistance and reduced oil consumption.
- OE-style roller block offers proven reliability while supporting upgraded performance.
- Excellent balance of everyday drivability, performance, and value for engine replacement or upgrade projects.
Is the ATK HP99C engine ready for installation?
Yes. The HP99C is supplied as a complete Stage 3 long block with many key components already installed, including the intake manifold, carburetor, distributor, water pump, oil pan, valve covers, and ignition components, reducing installation time.
Does this engine support a mechanical fuel pump?
No. The ATK HP99C does not have provisions for a mechanical fuel pump and must be used with an external electric fuel pump for proper fuel delivery.
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