ATK High Performance GM 350 Vortec 290 HP Stage 3 Long Block Crate Engines HP99C

Buy ATK High Performance GM 350 Vortec 290 HP Online

The ATK High Performance GM 350 Vortec 290 HP is a smart choice for builders who want dependable small-block Chevy power with strong street manners. Built around a 350ci Vortec platform, this Stage 3 long block delivers 290 horsepower and 375 lb-ft of torque, giving you a balanced mix of throttle response, drivability, and usable low-end pull. With a 9.4:1 compression vortec 350 engine ratio, cast-iron heads and block, 4.060-inch bore, 3.480-inch stroke, and hypereutectic mn 360 motor pistons, this engine is designed for reliable performance in classic muscle cars, trucks, and restoration projects.

It is especially appealing for anyone replacing a tired SBC while upgrading to a proven package that supports vacuum-operated accessories and everyday cruising. The ATK High Performance GM 350 Vortec 290 HP is engineered for enthusiasts who want an easy vortec 350 motor path to fresh V8 power without sacrificing durability. Whether you are refreshing a weekend cruiser or building a strong street machine, this long block offers a trusted foundation 350 vortec motor from a recognized performance engine brand. Its seasoned OE two-bolt main block, one-piece rear seal design, moly rings, and performance-minded internals help create an upgrade for owners seeking consistent output, classic vortec 350 engine for sale Chevy fitment appeal, and a smoother route to installation than a custom build.

Product Specifications

ATK High Performance GM 350 Vortec 290 HP – HP99C

• Engine family: Chevy Small Block / 350ci (5.7L)
• Power output: 290 horsepower and 375 lb-ft of torque
• Block: OE roller block, 2-bolt main, 1-piece rear seal, 1996–2000 style
• Bore x stroke: up to 4.060 in. x 3.480 in.
• Crankshaft: OE reground, external balance rear / internal balance front
• Connecting rods: OE powder metal, 5.7 in.
• Pistons: Hypereutectic, 9.4:1 compression ratio
• Rings: Moly
• Camshaft: Hydraulic roller
• Cam specs: 191/194 @ .050, .414 in./.428 in. lift, 111 LSA
• Timing set: Single roller timing chain
• Cylinder heads: Vortec cast iron, 64cc chambers, 1.94/1.50 valves; the linked retailer also references 165cc intake runners and stamped steel 1.5-ratio rocker arms.

Product Benefits

• Strong street performance: With 290 hp and 375 lb-ft, this engine delivers a solid balance of acceleration, low-end torque, and everyday drivability.
• Excellent for SBC replacement builds: ATK positions the HP99C as a replacement for worn-out small-block Chevy combinations, making it a practical upgrade for restorations and street projects.
• Street-friendly setup: JEGS describes this 350 as having great street manners and enough vacuum for common power accessories, which is valuable for cruisers and classic street cars.
• Proven Vortec-based combination: The Vortec cast-iron head design and matched internal component package support dependable performance and consistent output.
• Built for durability: Hypereutectic pistons, moly rings, a hydraulic roller cam, and a single-roller timing chain create a dependable foundation for long-term street use.

What is the ATK High Performance GM 350 Vortec 290 HP best suited for?

The ATK High Performance GM 350 Vortec 290 HP is best suited for street-driven classics, restoration builds, and small-block Chevy replacements that need dependable power, solid torque, and good vacuum for everyday accessories.

What should buyers confirm before ordering this engine?

Buyers should confirm the exact included components and any core-charge terms before purchase, because the linked retailer titles HP99C as a Stage 3 long block, while other sellers list HP99C in complete-engine configurations and may apply a refundable core charge.