LS376/525 Long Block

High-Performance 6.2L LS3 Long Block for Serious Street and Track Builds

The LS376/525 Long Block is a premium Chevrolet Performance engine package engineered for enthusiasts who demand exceptional horsepower, proven reliability, and the flexibility to customize their build. Producing 525 horsepower, this 6.2L (376CI) Gen IV LS-based long block is an excellent foundation for muscle cars, hot rods, restomods, pro-touring vehicles, and custom engine swap projects.

Built around a lightweight aluminum LS3 block, the LS376/525 Long Block features premium performance components, including high-flow aluminum cylinder heads, a hydraulic roller camshaft, and a performance rotating assembly. Designed to deliver strong acceleration, impressive mid-range torque, and excellent street manners, this engine is equally at home on the highway or the track.

Performance Without Compromise

The LS376/525 Long Block offers the ideal balance of power, durability, and customization. Since it is supplied as a long block, builders have the freedom to choose their preferred intake manifold, fuel system, front accessory drive, ignition components, and engine management system to suit their specific vehicle and performance goals.

Whether you’re completing a classic muscle car restoration or building a modern street machine, the LS376/525 provides the legendary LS performance trusted by enthusiasts worldwide.

Key Features

• 6.2L (376CI) Gen IV LS3-based long block
• Produces 525 horsepower
• Lightweight aluminum engine block
• High-flow aluminum cylinder heads
• Performance hydraulic roller camshaft
• Premium rotating assembly for durability and reliability
• Excellent throttle response and broad power band
• Ideal for naturally aspirated performance builds
• Perfect for muscle cars, hot rods, restomods, and custom LS swaps
• Built to Chevrolet Performance standards

Ideal Applications

The LS376/525 Long Block is a versatile engine choice for a wide range of performance projects, including:

• Classic muscle cars
• Street rods and hot rods
• Restomod builds
• Pro-touring vehicles
• Custom performance cars
• Engine replacement and LS conversion projects

Why Choose the LS376/525 Long Block?

• Proven 525 HP Chevrolet Performance platform
• Lightweight aluminum construction for improved handling
• Reliable, street-friendly performance with track-ready capability
• Flexibility to customize your induction, accessories, and electronics
• Ideal foundation for high-performance engine swaps
• Built for long-lasting durability and dependable operation

The LS376/525 Long Block delivers the perfect combination of modern LS technology, outstanding horsepower, and installation flexibility, making it a top choice for enthusiasts looking to build a powerful, reliable, and customizable performance vehicle.