Chevrolet Performance LSX 376-B15 Crate Engine – 525 HP Iron Block LSX

The Ultimate Iron Block LSX Crate Engine for Maximum Performance

The Chevrolet Performance LSX 376-B15 crate engine delivers race-proven performance in an iron-block long block package that’s ready to transform your classic car, hot rod, or custom build. As part of our extensive LS Engines collection, this 6.2L/376 cubic inch V8 produces an impressive 525 horsepower and 486 lb-ft of torque—making it the perfect choice for enthusiasts seeking the durability of an iron block with the proven performance of the LSX platform.

Built on the legendary LSX cast iron block with a forged rotating assembly and L92-style aluminum cylinder heads, this LSX 376 Pro Series engine is dyno-proven and designed for serious performance applications. Whether you’re building a weekend warrior, a drag-race monster, or a street machine, this Chevrolet Performance LSX 376 crate engine provides the foundation for an unforgettable driving experience.

What Makes the LSX 376-B15 the Ultimate Iron Block Crate Engine?

The LSX 376-B15 is engineered for enthusiasts who want the best of both worlds—the proven LSX iron block durability combined with the ASA camshaft that delivers 525 horsepower. Chevrolet Performance has taken the LSX iron block and equipped it with the ASA camshaft used in the LS376/525, producing a 525 HP engine with a 376 cubic inch displacement. The iron block provides exceptional durability for high-horsepower applications, making it an ideal choice for boost-ready builds or serious naturally aspirated performance.

LSX 376 Horsepower and Torque Figures

This iron-block crate engine produces impressive output:

• 525 horsepower – dyno tested and verified

• 486 lb-ft torque – strong mid-range power for street and strip

• 10.7:1 compression ratio – pump gas friendly

• Hydraulic roller cam – low maintenance, excellent durability

• 6,600 RPM maximum recommended engine speed

Complete LSX 376 Engine Specifications

LSX Cast Iron Block

The foundation of this Chevrolet Performance LSX 376 is the legendary LSX cast iron block, featuring:

• Cast iron construction – exceptional durability for high-horsepower applications

• 6-bolt main caps – superior bottom-end strength

• 4.065-inch bore x 3.622-inch stroke (376 CID / 6.2L)

• 1-piece rear main seal – leak-free operation

• LSX iron block – proven platform for serious performance

Forged Rotating Assembly

The rotating assembly is built for durability:

• Forged steel crankshaft

• Forged steel connecting rods

• Hypereutectic aluminum pistons

• 10.7:1 compression ratio

L92-Style Aluminum Cylinder Heads

The L92-style aluminum cylinder heads feature:

• 68cc combustion chambers

• 2.165-inch intake valves

• 1.590-inch exhaust valves

• Rectangular ports for exceptional flow

• 1.7:1 ratio rocker arms

Aggressive ASA Camshaft Specifications

What’s Included with Your LSX 376-B15 Crate Engine

The 19417356 comes as a long block assembly with the following components included:

Important Note: The following components are NOT included and must be sourced separately:

• Engine controller (ECU) – Chevrolet Performance recommends P/N 19354332

• Wiring harness

• Flexplate/flywheel

• Front accessory drive components

Installation Notes and Critical Considerations

Important Notes Before Installation

Before installing your Chevrolet Performance LSX 376-B15, review these critical notes:

• Requires engine controller kit – Chevrolet Performance P/N 19354332 (specifically calibrated for this engine)

• Front-end accessory drive components must be sourced separately

• Oil pan – Camaro F-body pan included may require replacement with Chevrolet Performance Muscle Car Oil Pan Kit P/N 19212593 for older vehicle installations

• Recommended fuel: Premium pump gasoline

• Recommended torque converter stall speed: 3,000-3,400 RPM

Emissions Compliance

Important: This engine is designed for pre-1976 street vehicles or off-road applications. Verify emissions compliance for your specific jurisdiction.

Recommended Components

For a complete build, Chevrolet Performance recommends:

• Engine Controller Kit – P/N 19354332 (specifically calibrated for LSX 376)

• Flexplate – non-weighted, external balance

• Front-End Accessory Drive – available in several configurations

• Exhaust Manifolds – sourced separately

LSX 376-B15 Crate Engine FAQs

What is the horsepower and torque of the LSX 376-B15?

The Chevrolet Performance LSX 376-B15 produces 525 horsepower and 486 lb-ft of torque .

What is the LSX 376 engine based on?

The LSX 376-B15 is built on the LSX cast iron block – Chevrolet Performance’s heavy-duty iron block platform designed for serious performance applications.

What’s included with the LSX 376-B15?

The LSX 376-B15 includes the long block assembly with iron LSX block, aluminum heads, forged rotating assembly, intake manifold, fuel rails, injectors, throttle body, ignition coils, oil pan, valve covers, timing cover, water pump, and harmonic balancer. ECU and wiring harness are not included.

What camshaft does the LSX 376-B15 use?

The LSX 376-B15 uses the ASA (American Speed Association) racing camshaft with .525-inch lift on both intake and exhaust, 226° intake duration, 236° exhaust duration, and a 110° lobe separation angle.

What fuel does the LSX 376-B15 require?

Premium pump gasoline is recommended for optimal performance.

Is the LSX 376-B15 the same as the LS376/525?

The LSX 376-B15 uses the same ASA camshaft and produces the same 525 horsepower as the LS376/525, but features the LSX iron block instead of the LS3 aluminum block, providing additional durability for high-performance applications.