585 HP · 520 lb-ft · 427 c.i. · 91+ Octane · Dyno Tested · 30-Month/50,000-Mile Warranty Built for high-output LS applications, this GM LS3-compatible 427 crate engine produces 585 horsepower and 520 lb-ft of torque from a 4.0695-inch bore and 4.125-inch stroke. The engine uses a high-strength LSX-style cast-iron block with a six-bolt main design, priority main oiling, increased deck thickness, reinforced webbing, and extended cylinder skirts. A forged rotating assembly, aluminum cylinder heads, and hydraulic roller cam provide the strength and airflow required for demanding off-road, racing, and street use. This base-dressed package includes the LS3 aluminum intake manifold, drive-by-wire throttle body, fuel injectors, fuel rails, ignition coils, water pump, LS swap oil pan, harmonic balancer, and valve covers. The ECU, wiring harness, accessory drive, transmission controls, exhaust, and vehicle-specific installation components are sold separately. Need to confirm fitment or get an exact delivered price? Call or text our team before ordering. Includes: GM LS-Compatible 427 Base-Dressed Engine BluePrint LS3 Aluminum Cylinder Heads Hydraulic Roller Camshaft LS3 Cast-Aluminum Intake Manifold Drive-by-Wire Throttle Body 42 lb/hr Fuel Injectors Fuel Rails Ignition Coil Packs Spark Plugs and Wiring LS Valve Covers LS Swap Oil Pan Water Pump Timing Cover Harmonic Balancer Note: ECU, wiring harness, accessory drive, transmission controls, exhaust, and vehicle-specific installation components are NOT included. Specifications Specification Details Engine Platform GM LS Compatible Displacement 427 Cubic Inches Horsepower 585 HP Torque 520 lb-ft Compression Ratio 11.0:1 Block Material High-Strength Cast Iron Block Style LSX-Style Main Configuration 6-Bolt Main Bore 4.0695 Inches Stroke 4.125 Inches Rear Main Seal One Piece Engine Balance Internally Balanced Front and Rear Recommended Fuel 91+ Octane Crankshaft Forged Steel Connecting Rods Forged 6.125-Inch Rods Pistons Forged Piston Design 22cc Dish Cylinder Heads BluePrint Aluminum Heads – PS8015 Combustion Chamber 69cc Intake Valve Diameter 2.165 Inches Exhaust Valve Diameter 1.590 Inches Intake Runner Volume 259cc Exhaust Runner Volume 102cc Camshaft Type Hydraulic Roller Intake Lift .624 Inch Exhaust Lift .624 Inch Intake Duration at .050 239 Degrees Exhaust Duration at .050 255 Degrees Lobe Separation Angle 114 Degrees Camshaft Configuration Three Bolt Intake Manifold LS3 Cast Aluminum Throttle Body Drive by Wire Fuel Injectors 42 lb/hr at 58 PSI Fuel Rail Included ECU Not Included Wiring Harness Not Included Installation Notes Requires a non-weighted flexplate or flywheel. BluePrint Engines recommends a 2200 RPM or higher stall converter for automatic transmission applications. The included retrofit oil pan is designed to fit many 1955–1995 GM front-engine, rear-wheel-drive V8 vehicles, but installation clearance should always be verified. Not intended for pollution-controlled vehicles. Not designed for dry-sump applications. Vehicle gearing, tire size, weight, intake design, headers, exhaust, drivetrain configuration, and engine-management calibration can affect final installed performance. The purchaser must supply a compatible ECU, engine wiring harness, drive-by-wire pedal assembly, and any required transmission or body controls. Professional installation and final calibration are recommended. Important Fitment Notice Engine swaps and custom vehicle builds frequently require additional fabrication, wiring, plumbing, tuning, and vehicle-specific components. Confirm oil-pan clearance, engine mounts, transmission compatibility, flexplate or flywheel requirements, accessory-drive spacing, exhaust clearance, fuel pressure, cooling capacity, and electronic-control compatibility before ordering. Built by Off-Road People, Supported by Off-Road PeopleWide Open Design has more than 20 years of experience building LS-powered rock crawlers, trail rigs, race cars, and custom tube-chassis vehicles. We can help you match the engine with the correct cooling system, fuel delivery, transmission, drivetrain, and installation components for your build. Frequently Asked Questions Does this engine include an ECU and wiring harness? No. This engine includes the fuel injectors, fuel rails, coil packs, sensors, intake manifold, and drive-by-wire throttle body, but it does not include an ECU or engine wiring harness. A compatible controller and harness must be purchased separately. Is this engine considered a complete crate engine? This is a base-dressed engine rather than a fully turnkey package. It includes many of the major induction, ignition, cooling, and external engine components, but additional parts such as the ECU, wiring harness, drive-by-wire pedal, accessory drive, starter, air intake, exhaust, and vehicle-specific installation components may still be required. What type of fuel does the 427 LS require? BluePrint Engines recommends 91-octane or higher gasoline. The 11.0:1 compression ratio and performance-oriented camshaft make the engine unsuitable for regular low-octane fuel. Will this engine work for an LS swap? Yes. The engine includes an LS swap-style oil pan and uses common LS3-style front and rear covers. However, fitment depends on the vehicle, engine mounts, oil-pan clearance, accessory drive, headers, cooling system, transmission, wiring, and engine-management system. Does this engine require a special torque converter? For automatic-transmission applications, BluePrint Engines recommends a torque converter with a stall speed of at least 2200 RPM. The ideal stall speed may vary depending on vehicle weight, gearing, tire size, transmission, and intended use. Is the engine internally balanced? Yes. The rotating assembly is internally balanced at both the front and rear. A non-weighted flexplate or flywheel is required. Is this engine suitable for off-road use? The high-strength cast iron block, six-bolt main configuration, forged rotating assembly, aluminum cylinder heads, and broad 520 lb-ft torque output make it a strong option for high-performance off-road builds. The complete vehicle must still use an appropriately sized cooling system, fuel system, drivetrain, engine mounts, and ECU calibration.
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