BLUEPRINT ENGINES BLS4273KB4L7 Blueprint Engines BLS4273KB4L7 LS 427 Standard Edition Crate Engine with 4L65E/4L70E Compatibility

The Blueprint Engines BLS4273KB4L7 LS 427 Standard Edition crate engine is a high-performance GM LS-series powerplant designed for street, performance, and custom vehicle applications. Producing 605 horsepower from a 427 cubic-inch displacement, this base dressed engine delivers substantial power potential in a practical, ready-to-install configuration. Its LS architecture provides broad aftermarket support and compatibility with a wide range of performance components, making it a strong choice for builders seeking dependable power and upgrade flexibility.
The engine is supplied with pulleys included and is configured for compatibility with 4L65E and 4L70E automatic transmissions. This setup is well suited for projects requiring a powerful LS-based engine while retaining a familiar transmission platform. The base dressed configuration helps simplify installation planning by providing essential engine components without adding unnecessary accessories that may not suit every vehicle build.
Blueprint Engines is recognized for producing performance-focused crate engines for enthusiasts, restorers, and custom vehicle builders. The BLS4273KB4L7 combines large-displacement LS performance with a straightforward installation approach, making it suitable for street rods, muscle cars, pro-touring builds, and other high-output applications. Review vehicle fitment, accessory requirements, engine management, fuel delivery, cooling, exhaust, and transmission specifications before installation to ensure proper system compatibility.
This Blueprint Engines LS 427 crate engine is not air restricted and is not designated as truck-freight-only. Professional installation and appropriate tuning are recommended to help achieve reliable performance and proper operation.

Features:

• Brand: Blueprint Engines

• Part Number: BLS4273KB4L7

• Engine Type: GM LS-series crate engine

• Displacement: 427 cubic inches

• Rated Output: 605 horsepower

• Configuration: Base dressed engine

• Transmission Compatibility: Designed for 4L65E and 4L70E applications

• Included Components: Pulleys included

• Application: Street, performance, custom, and restoration vehicle builds

• Shipping Classification: Not designated as truck-freight-only