BluePrint Engines BP4003CT1 GM 400 CID 508 HP Base 6in Rod LB

BluePrint BP4003CT1 508 HP 6in Rod Long Block

BluePrint BP4003CT1 GM 400 CID 508 HP Base 6in Rod LB units deliver a high-output sturdy engine architecture for Chevrolet enthusiasts seeking elite Small Block power with an optimized rod-to-stroke ratio. This 6.6L 400ci build features high-flow aluminum cylinder heads and precision-engineered 6-inch rods, specifically designed to maintain mechanical stability and power efficiency under high-performance street loads. Built with a modern hydraulic roller camshaft and a precision external balance, this core is a perfect fit for iconic GM platforms requiring elite mechanical displacement and reliability.

As a precision-machined long block foundation, this assembly arrives in an induction-ready state, allowing for customized build specifications with specific induction and accessory systems. The BluePrint BP4003CT1 is supported by an industry-leading 30-Month / 50,000-mile limited warranty, providing long-term structural reliability for your project. This high-performance core is designed for builders who require elite assembly standards and modern manufacturing reliability in a traditional 400ci Chevy package protected by a one-piece rear main seal.

Key Features of BluePrint High Performance BP4003CT1

• 6.6L 400ci displacement delivering 508 horsepower performance.
• Optimized 6-inch rod length for improved mechanical power and longevity.
• High-flow aluminum cylinder heads for superior thermal management.
• Hydraulic roller camshaft architecture for reduced friction and durability.
• External engine balance configuration for smooth power delivery.
• Modern one-piece rear main seal prevents common small-block oil leaks.
• Backed by a premium 30-Month / 50,000-mile limited warranty.

BP4003CT1 Include:

• Oil Pan
• Valve Covers
• Timing Cover