BluePrint PSLS4272CTF 427 LS Crate Engine – 625 HP / 565 TQ EFI

The Ultimate 427 LS Crate Engine for Maximum Performance

The BluePrint PSLS4272CTF 427 LS crate engine delivers massive horsepower and torque in a fully dressed EFI package that’s ready to transform your classic car, hot rod, or custom build . As part of our extensive LS Engines collection, this 7.0L/427 cubic inch V8 produces an impressive 625 horsepower and 565 lb-ft of torque—making it one of the most formidable naturally aspirated LS crate engines in BluePrint’s Pro Series lineup .

Built on a new GM 6.2L aluminum block with a forged 4.125-inch stroke crankshaft and forged pistons, this 427 Pro Series engine is dyno-tested and backed by an exclusive 30-month/50,000-mile warranty . Whether you’re building a weekend warrior, a track-day monster, or a show-winning restomod, this BluePrint 427 LS crate engine provides the foundation for an unforgettable driving experience.

What Makes the BluePrint 427 LS the Ultimate LS Crate Engine?

The PSLS4272CTF is engineered for enthusiasts who want maximum power with modern EFI drivability. BluePrint Engines has established itself as a leader in the crate engine market, and the Pro Series 427 represents their commitment to dyno-proven performance backed by an exclusive warranty .

Every BluePrint Pro Series engine is individually dyno-tested and ships with its own dyno sheet, guaranteeing the power you paid for . The engine features a complete EFI retrofit system with ECM, wiring harness, throttle pedal, and all sensors required to run—making it a true turn-key solution .

427 LS Horsepower and Torque Figures

This LS-based crate engine produces staggering output:

• 625 horsepower – dyno tested and verified 

• 565 lb-ft torque – massive power across the RPM range 

• 11.0:1 compression ratio – pump gas friendly 

• Hydraulic roller cam – low maintenance, excellent durability 

Complete 427 LS Engine Specifications

New GM 6.2L Aluminum Block

The foundation of this BluePrint 427 crate engine is a new GM 6.2L aluminum block, machined in the USA . Key block features include:

• All-aluminum construction – lightweight and durable

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

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

• 4.069-inch bore – precision machined to exacting tolerances 

Forged Rotating Assembly

The rotating assembly in the PSLS4272CTF is built for durability and high horsepower:

• 4340 forged crankshaft – 4.125-inch stroke 

• 4340 forged 6.125-inch connecting rods – race-proven strength 

• Forged pistons – 11.0:1 compression 

• Internal engine balance – smooth operation at high RPM 

BluePrint Aluminum Cylinder Heads

The BluePrint PS8015 aluminum cylinder heads provide exceptional flow :

Performance Hydraulic Roller Camshaft Specifications

What’s Included with Your PSLS4272CTF Crate Engine

The PSLS4272CTF comes as a fully dressed long block with the following components included :

Important Note: The following components are NOT included :

• Water pump

• Flexplate or flywheel (requires non-weighted flexplate/flywheel) 

• Front accessory drive (available on dressed variants) 

PSLS4272CTF – ECU and Tuning Information

Engine Control Package Details

The PSLS4272CTF comes with a complete LS controller package that includes :

• ECM with custom tune installed 

• Engine wiring harness 

• Drive-by-wire throttle pedal assembly 

• All sensors required for engine operation 

Critical Notes:

• The ECM is engine control only – it cannot control the transmission 

• A separate transmission controller is required for electronic automatic transmissions 

• The ECU is unlocked for further refinement at a dyno shop if required 

• Air Intake Kit BPPLS01013 is recommended to ensure correct MAF calculations and dyno calibration 

Installation Notes and Technical Information

Critical Installation Requirements

Before installing your BluePrint PSLS4272CTF, review these critical notes:

• Requires a non-weighted flexplate/flywheel 

• 2200+ RPM stall converter recommended for automatic applications 

• 91+ octane fuel required 

• Not for use in pollution-controlled vehicles 

• Not for dry sump applications 

• Ignition timing and spark advance are controlled by the Powertrain Control Module 

• Firing order: 1,8,7,2,6,5,4,3 

Compatible Applications

The included retro-fit oil pan will fit most 1955-1995 GM front engine, RWD, V8 cars . This engine is designed as a drop-in replacement for vehicles originally equipped with an LS engine or for custom LS swap projects.

Emissions Information

This engine is not for use in pollution-controlled vehicles . It is designed for pre-1976 street vehicles, off-road applications, or competition use only.

Warranty

BluePrint Engines backs the PSLS4272CTF with a comprehensive 30-month / 50,000-mile warranty .

BluePrint PSLS4272CTF FAQs

What is the horsepower and torque of the PSLS4272CTF?

The BluePrint PSLS4272CTF produces 625 horsepower and 565 lb-ft of torque. Every engine is dyno tested and ships with printed results .

What is the 427 LS engine based on?

The PSLS4272CTF is built on a new GM 6.2L aluminum block with a 4.069-inch bore and 4.125-inch stroke, producing 427 cubic inches .

Does the PSLS4272CTF include an ECU?

Yes. The PSLS4272CTF includes a complete EFI system with ECM, wiring harness, throttle pedal, and all sensors required to run the engine. The ECM comes with a custom tune installed .

What fuel does the 427 LS engine require?

91+ octane fuel is recommended for this high-performance LS engine .

What warranty comes with this engine?

BluePrint Engines backs the PSLS4272CTF with a 30-month / 50,000-mile warranty .

What is included with this engine?

The PSLS4272CTF is a fully dressed long block including the engine assembly, LS3 intake manifold, 87mm throttle body, fuel injectors, coil packs, spark plugs and wires, harmonic balancer, oil pan, valve covers, timing cover, ECM, wiring harness, and throttle pedal. Water pump and flexplate are not included .

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