BluePrint Engines Pro Series GM LS 427 C.I. 585HP Deluxe Dressed Crate Engine w/Black Pulley Kit /Holley Terminator X EFI System PSLS42781CTFKB

This powerhouse of an engine build is a testament to precision engineering and raw performance. Delivering a formidable 585 horsepower and 520 ft. lbs. of torque, it’s driven by a BluePrint Engines LSX-style high-strength cast iron block, paired with forged crank and pistons for uncompromising durability. The 11:1 compression ratio ensures optimal combustion efficiency, while LS3 aluminum heads and a hydraulic roller cam (featured twice for emphasis on valvetrain performance) bring refined airflow and aggressive cam timing. Feeding this beast is a drive-by-wire throttle body and LS3 cast aluminum intake manifold, supported by a complete injector and fuel rail kit for consistent fuel delivery. The LS swap oil pan, water pump, and gas pedal round out the essentials, while the Holley Terminator X Max ECU provides cutting-edge engine management. A black pulley kit featuring an LS2-style water pump, 140-amp alternator, peanut-style A/C compressor, and Type II power steering pump with remote reservoir ensures accessory systems run smoothly and reliably. Altogether, this setup blends brute force with modern control, making it ideal for high-performance street applications.

Description: 
Horsepower & Torque: 585 Horsepower / 520 ft. lbs. Torque
Compression Ratio: 11:1
BluePrint Engines LS3 Aluminum Heads
BluePrint Engines Hydraulic Roller Cam
BluePrint Engines Forged Crank
BluePrint Engines Forged Pistons
Block:
BluePrint Engines High Strength Cast Iron (LSX Style) Block
Increased Deck Thickness and Strength Webbing
Utilizes OEM LS3 Front and Rear Covers
Improved Water Jacket Design
Extended Cylinder Skirt
1-Piece Rear Main Seal
Priority Main Oiling
4.0695" Bore
6-Bolt Main
Rotating Assembly:
Forged Crankshaft
4.125" Stroke
Forged 6.125" Connecting Rods
Forged Pistons
Internally Balanced Front and Rear
Cylinder Heads:
BluePrint Aluminum Cylinder Heads - PS8015
69cc Chamber
2.165" Intake / 1.590" Exhaust Valves
259cc Intake / 102cc Exhaust Runners
Cam Specs:
Hydraulic Roller
.624 Intake / .624 Exhaust Lift
239 Intake / 255 Exhaust Duration
@.050-114 Degree Lobe Separation
Holley Terminator X Max Specific Features and Benefits:
Real Time Fuel Map Learning Simplifies Tuning by Dynamically Adjusting the Base Fuel Rate
On Board Bosch LSU 4.9 Wideband Control, Enabling Accurate AFR Readings and Closed Loop Tuning
Eight High Impedance Injector Drivers, Ideal for Stock LS Injectors and Holley EFI Injectors
Integrated 1-Bar MAP Sensor for Naturally Aspirated or Nitrous Setups, with Harness Support for External Higher Bar Sensors if needed
4 Configurable Inputs (12V, Ground, 5V, Frequency) and 2 Outputs (Ground, PWM) - Ideal for Electric Fans, Boost Control Solenoids, Nitrous Control and more
Free PC Tuning Software via USB/CAN Interface for Full Laptop Control and Advance Setup
Integrated 3.5" Touchscreen Handheld with Setup Wizard, Internal Data Logging, and Real Time Gauge Displays
Terminator X Max ECU will Include a Base Timing Map Pre-Configured for this engine
Also Includes:
Drive by Wire Throttle Body - BPP12191019
LS3 Cast Aluminum Intake Manifold
LS Swap Oil Pan - BPP81074
Injectors and Fuel Rail Kit
Spark Plugs & Wiring
Harmonic Balancer 
Timing Cover
Valve Covers
Coil Packs
Gas Pedal
Black Pulley Kit
LS2 Style Water Pump
1- Wire 140amp Alternator
Peanut Style Air Conditioning Compressor
Type II Power Steering Pump with Remote Reservoir
Notes:
This Holley EFI Equipped engine has a fully calibrated ECU by BluePrint Engines. Please DO NOT follow the Holley EFI manual for the calibration of the ECU.
The front accessory drive on this engine fits many vehicles, however it is the customer responsibility to accurately measure and confirm fitment.  Note this is a low-profile design, but things such as power steering hoses, alternator wiring, and additional fittings/fabrication may be required on some vehicles.
Retro fit oil pan will fit most 1955-1995 GM front engine, RWD, V8 cars
Not for use in pollution-controlled vehicles or in dry sump applications.
BluePrint Engines Recommends Air Intake Kit BPPLS01013 to ensure correct MAF calculations and Dyno calibration are maintained with the provided ECU / tuning.

BluePrint engine the industry's best-in-class warranty for 30-months / 50,000 miles — with the extra confidence only BluePrint can provide. The warranty applies to individual or professional installations and is fully transferable.

Every BluePrint engine is Dyno tested and has strict parameters to pass and
be shipped to the customer. All parts are tested before being released for production:
• DC and Pneumatic assembly tools calibrated daily
• Fatigue Testing
• Durability Testing
• Random subassembly testing
• Quality system is ISO 9001: 2015 certified
• Traceable engine “DNA” electronic barcode record keeping of
manufacturing and performance data