Overview
BluePrint Engines 427 C.I. LS Pro Series Engine — 605 HP
Built for high-performance street and swap applications, this 427 cubic-inch LS-based engine pairs a high-strength LSX-style cast-iron block with forged rotating components and BluePrint aluminum cylinder heads. It delivers 605 horsepower and 565 ft-lbs of torque, with an 11:1 compression ratio and a hydraulic roller camshaft.
The engine comes equipped with fuel rails and injectors, a drive-by-wire throttle body, intake manifold, water pump, ignition components, and sensors. Engine management is not included, so plan for a compatible ECU and wiring harness.
Key Specifications
- Displacement: 427 cubic inches
- Horsepower: 605 hp
- Torque: 565 ft-lbs
- Compression ratio: 11:1
- Fuel recommendation: 91+ octane
- Block: High-strength LSX-style cast iron, 6-bolt mains
- Bore and stroke: 4.0685" × 4.125"
- Rotating assembly: Forged crankshaft, 6.125" forged connecting rods, and forged pistons
- Cylinder heads: BluePrint LS3 aluminum heads, 69cc chambers, 2.165" intake and 1.590" exhaust valves
- Camshaft: Hydraulic roller; .624" intake/.624" exhaust lift, 239°/255° duration at .050", 114° lobe separation angle
Included Equipment
- LS swap oil pan, windage tray, and pickup screen
- Fuel injectors and fuel rail
- Drive-by-wire throttle body
- GM plastic intake manifold
- Water pump
- Spark plugs and wires
- Coil packs, sensors, and harmonic balancer
Important Installation Notes
ECU, engine controller, and wiring harness are not included.
- Requires a non-weighted flexplate or flywheel.
- BluePrint recommends a 2200+ RPM stall converter.
- The retrofit oil pan fits most 1955–1995 GM front-engine, rear-wheel-drive V8 cars.
- Not intended for pollution-controlled vehicles or dry-sump applications.
- BluePrint recommends its LS air intake kit to maintain the correct MAF calculations and dyno calibration.
Confirm application and compatibility with your vehicle and selected engine management system before ordering.