LSX454 Long Block Kit

Big-Block Power in a Compact LS Platform

The LSX454 Long Block Kit is the ultimate choice for enthusiasts seeking massive naturally aspirated horsepower without the size and weight of a traditional big-block engine. Built around Chevrolet Performance’s heavy-duty LSX cast-iron block, this 454 cubic-inch (7.4L) Gen IV V8 delivers an impressive 627 horsepower and 586 lb-ft of torque, making it an ideal foundation for street machines, drag cars, pro-touring builds, and custom performance projects.

Designed for extreme strength and reliability, the LSX454 features a forged 4340 steel crankshaft, forged steel connecting rods, forged aluminum pistons, and high-flow LSX-LS7 six-bolt aluminum cylinder heads. This premium combination provides exceptional durability, outstanding airflow, and the confidence to handle aggressive driving and high-performance applications.

Key Features

• 454CI (7.4L) LSX Gen IV long block
• 627 horsepower and 586 lb-ft of torque
• Heavy-duty LSX cast-iron block with six-bolt, cross-bolted main caps
• 4340 forged steel crankshaft with 8-bolt flange
• 4340 forged steel connecting rods
• Forged aluminum pistons
• Hydraulic roller camshaft
• LSX-LS7 rectangular-port aluminum cylinder heads
• 11.0:1 compression ratio
• Internal engine balance
• 58X reluctor wheel
• Premium performance components throughout for exceptional durability

Built for Serious Performance

The LSX454 Long Block is engineered to produce the torque of a traditional big-block while maintaining the compact dimensions of the LS engine family. This allows for easier installation in a wide variety of muscle cars, hot rods, street rods, and race vehicles without sacrificing performance or engine bay space.

The long block is supplied without an intake manifold, oil pan, electronics, or front accessory drive, giving builders the flexibility to choose components that best match their performance goals and vehicle application. It requires an LS7-style intake manifold and is intended primarily for pre-1976 street vehicles and off-road or competition use.

Why Choose the LSX454 Long Block Kit?

• Factory-built Chevrolet Performance long block
• Massive 627 HP and 586 lb-ft output
• Premium forged rotating assembly for exceptional strength
• Compact LS dimensions with big-block performance
• Ideal for naturally aspirated high-performance builds
• Excellent foundation for street, strip, pro-touring, and custom engine swap projects
• Built to deliver outstanding reliability, durability, and race-inspired performance