Chevrolet Performance LS376/525 Long Block – 376 c.i. (6.2L), Gen IV Small-Block V-8

The Core of LS Power – Build Your Dream Engine with the LS376/525 Long Block

The Chevrolet Performance LS376/525 Long Block offers builders a cost-effective foundation to create a custom LS engine that matches their specific needs. Designed as the core of the powerful LS376/515 crate engine, this long block delivers the proven durability and performance of the Gen IV LS-series V-8. It’s perfect for builders looking to complete their assembly with their choice of intake manifold, ignition system, and accessories.

This 376 c.i. (6.2L) powerhouse is built with premium components, including a cast aluminum block, hydraulic roller camshaft, and aluminum L92-style cylinder heads, delivering modern LS performance and reliability.

What’s Included?

The LS376/525 long block provides the core essentials:

• Chevy F-Body Wet Sump Oil Pan for compatibility with a range of applications.
• Nodular Iron Crankshaft and hypereutectic pistons for durability.
• L92-Style Aluminum Cylinder Heads with high-flow ports and 68cc chambers.
• Fully assembled bottom and top ends, ready for your custom finishing touches.

Performance Highlights

• Displacement: 376 c.i. (6.2L)
• Compression Ratio: 10.7:1 – Optimized for premium pump gas.
• Camshaft Specs:
  • Hydraulic Roller
  • Lift: 0.525" intake / 0.525" exhaust
  • Duration (@ .050): 226° intake / 236° exhaust
• Cylinder Heads:
  • 68cc combustion chambers for efficient compression.
  • 2.165" intake valves and 1.590" exhaust valves for superior airflow.
• Maximum Recommended RPM: 6,600

Built for Strength and Versatility

Block Features:

• Cast Aluminum Block (P/N 12623967): Lightweight and durable with 6-bolt, cross-bolted main caps for stability.

Rotating Assembly:

• Nodular Iron Crankshaft (P/N 12597569): Designed for strength and reliability under high-performance conditions.
• Powdered Metal Connecting Rods (P/N 12607475): Engineered for durability.
• Hypereutectic Aluminum Pistons (P/N 19207287): Built for high-compression performance.

Rocker Arms:

• Investment Cast with Roller Trunnions: Smooth and efficient valve operation with a 1.7:1 ratio.

Why Choose the LS376/525 Long Block?

This long block is ideal for builders and enthusiasts looking to:

• Customize an LS engine with their preferred intake manifold, ignition, and fuel system.
• Upgrade their Camaro, C10, Corvette, or Chevelle with modern LS performance.
• Build a reliable and powerful engine for pre-1976 street vehicles or off-road projects.

Key Specifications:

• Horsepower: Potential output depends on your custom configuration.
• Torque: Build it your way to achieve your performance goals.
• Induction: Ready for your intake manifold and fuel system.

Important Notes:

• Custom Assembly Required: Does not include electronics, intake manifold, fuel system, or ignition.
• Vehicle Compatibility: Ideal for pre-1976 street vehicles or off-road vehicles. Not intended for marine applications.