ATK GM 365 LQ9 550 HP LQ9-LB-1 Stage 1 Long Block

ATK LQ9-LB-1 550 HP Rebuilt Long Block

ATK GM 365 LQ9 550 HP LQ9-LB-1 Stage 1 Long Block engines leverage a performance LS crate motor architecture to deliver elite horsepower for custom vehicle projects. This 6.0L 364ci remanufactured unit utilizes high-flow aluminum cylinder heads and a 10.3:1 compression ratio to produce an aggressive 550 horsepower. Built on a seasoned cast-iron block with a precision-machined rotating assembly, this powertrain is engineered for enthusiasts who require the strength of an iron-block LS with the weight-saving benefits of high-performance aluminum top-end components.

Designing your high-output swap is simplified with this remanufactured LS foundation, though it arrives in an un-dressed Stage 1 state to allow for full accessory customization. While the ATK LQ9-LB-1 provides the complete long-block assembly, owners must integrate their own intake manifold, oil pan, and timing cover. The one-piece rear main seal effectively prevents common fluid weeping, ensuring a reliable and clean engine installation for classic muscle cars, modern trucks, or dedicated track vehicles.

Key Features of ATK High Performance LQ9-LB-1

• 6.0L 364ci displacement with verified 550 horsepower.
• Aluminum cylinder heads enhance airflow and cooling performance.
• Hydraulic roller camshaft optimized for aggressive LS duration.
• 10.3:1 compression ratio delivers high-output performance.
• Seasoned cast-iron block for maximum structural durability.
• Internal engine balance configuration for smooth operation.
• Professional-grade assembly ensures long-term LS reliability.

LQ9-LB-1 Include:

• Cylinder Heads