BluePrint Engines Pro Series GM LS 427 C.I. 585HP Base Dressed Crate Engine w/Holley Terminator X Max EFI System PSLS42781CTF

This powerhouse of an engine setup is built to deliver serious performance, boasting an impressive 585 horsepower and 520 ft. lbs. of torque. At its core is a BluePrint Engines high-strength cast iron LSX-style block, paired with forged internals including a crank and pistons for maximum durability under pressure. The 11:1 compression ratio ensures efficient combustion and power delivery, while the LS3 aluminum heads and hydraulic roller cam for enhanced airflow and responsiveness. Feeding this beast is a cast aluminum LS3 intake manifold, matched with high-performance injectors and a fuel rail kit. The drive-by-wire throttle body offers modern precision, and the LS swap oil pan, water pump, and gas pedal round out the essentials for seamless integration. Tying it all together is the Holley Terminator X Max system, providing advanced engine management and tuning capabilities. This setup isn’t just built—it’s engineered to dominate.

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:
New 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
Water Pump - BPPLS126WP
Injectors and Fuel Rail Kit
Spark Plugs & Wiring
Harmonic Balancer 
Timing Cover
Valve Covers
Coil Packs
Gas Pedal
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.
This engine requires a non-weighted flex plate/flywheel.
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