LS7 427ci V8 Engine – 660 HP

Take the LS7 427  engine platform beyond its factory configuration with this 660 HP LS7-based 427ci V8 engine package. Built around the 7.0L LS7 architecture, this high-output setup combines a performance-oriented camshaft and engine calibration with the lightweight aluminum-block design that made the LS7 a standout among GM’s Gen IV small-block engines.

The engine is built around a 7.0-liter / 427-cubic-inch aluminum V8 architecture and features forged-steel crankshaft components, titanium connecting rods, aluminum cylinder heads, titanium intake valves, and a dry-sump lubrication system. The listed configuration is rated at 660 HP and 540+ lb-ft of torque, making it a substantial step beyond the original factory LS7 output.

For buyers planning an engine swap or performance build, the package also includes a brand-new-in-box installation kit intended to simplify installation. The kit includes swap gaskets, mounting hardware, and accessory-drive components to help address the hardware required during installation.

LS7 427 Engine Specifications

What’s Included

This LS7 427ci engine package includes:

• Assembled 7.0L LS7 660 HP long-block assembly
• Factory dry-sump oil pan and internal scavenge pump
• CNC-ported aluminum cylinder heads
• Composite intake manifold
• Electronic throttle body
• Fuel rails and high-flow injectors
• Ignition coils
• Mounting brackets
• Spark plug wires
• Brand-new-in-box installation kit
• Swap gaskets and mounting hardware
• Accessory-drive components

Built for Performance-Oriented LS7 Projects

The 427ci LS7 platform is well suited to performance builds where displacement, high-RPM capability, and the LS architecture are central to the project. This configuration retains the fundamental 7.0L LS7 layout while targeting a substantially higher output than the original production specification.

The 660 HP rating applies to this specific performance configuration. Buyers should verify application requirements, engine-management compatibility, dry-sump equipment requirements, and any additional components needed for their particular vehicle or swap before installation.

Dry-Sump Lubrication

This engine uses a dry-sump lubrication system, including the factory dry-sump oil pan and internal scavenge pump. An external oil tank is required for a complete operating dry-sump system, so the lubrication system should be accounted for when planning the installation.

Before You Buy

Because LS7-based engines can be configured differently depending on the application, confirm the exact installation requirements for your vehicle before ordering. Pay particular attention to:

• Engine-management and electronic-throttle compatibility
• Fuel-system requirements
• Dry-sump oil-tank requirements
• Accessory-drive configuration
• Engine mounting and swap hardware
• Transmission compatibility
• Cooling-system requirements
• Any vehicle-specific wiring or calibration requirements

This helps ensure the LS7 427 engine is matched with the supporting components required for the intended build.

A High-Output 427ci LS7-Based Package

For a buyer specifically looking for an LS7 427 engine, this package combines the 7.0L displacement and LS7 architecture with a listed 660 HP performance configuration and a new installation kit. The result is a purpose-built foundation for a serious LS-powered project without relying on vague horsepower claims or generic LS engine terminology.