Blueprint Engines GM LS 427 ci EFI Retrofit Dress Crate Engine w/Accessory Drive [530 HP, 495 FT.-LBS]
138-PSLS4272CTFB
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Retrofit Engines
Built using a block and Blueprint heads, along with forged crank, rods, and pistons. Includes performance hydraulic roller cam and lifters, upgraded roller rockers, universal oil pan, GM intake, fuel injectors, rails, drive-by-wire throttle body, matching throttle pedal, sensors, coil packs, wiring harness, and new ECM with custom tune installed.
Recommended Stall Converter: 2200+ RPM
Recommended Fuel: 91-93 Octane
Block
- Cast iron block
- 6-bolt main
- 1-piece rear main seal
- 4.060 in. bore
Rotating Assembly
- Forged Crankshaft: 4.125 in. Stroke
- Forged Connecting Rods: 6.125 in. Length
- Mahle Forged Pistons 4.060 in. Bore
- 11:1 Compression
- Internally Balanced
Cylinder Heads
- Blueprint Cylinder Heads p/n 138-PS8015
- Combustion Chamber: 72 cc
- Intake Valve: 2.165 in.
- Intake Volume: 259 cc
- Exhaust Valve: 1.600 in.
- Exhaust Volume: 102 cc
Camshaft Specs
- Hydraulic Roller
- Duration at .050 in. Lift: 239-degrees Intake, 255-degrees Exhaust
- Lift: .624 in. intake, .624 in. Exhaust
- Lobe Separation: 114-degrees
Other Features
- GM L92 EFI Intake Manifold with fuel rails and 42 psi injectors
- Drive-by-wire throttle body with matching throttle pedal
- Retro-fit Oil Pan #809-19212593 fit most 1955-1995 GM front-engine, RWD, V8 vehicles
- ECM with the custom tune (will NOT control electronic transmissions)
- GM ignition coil packs and plug wires
- Spark Plugs: ACDelco 41-985 (.040 in. Gap)
- Includes coil packs, coil wiring harness, crank, cam, coolant, knock, oil pressure, map sensors, and complete accessory drive system (balancer, water pump, alternator, power steering pump, A/C compressor, belt, and all pullies).
Notes
- Not for EGR or pollution controlled vehicles
- Not for dry sump applications
- Internal balance
- LS controller package is for engine control only, it does not contain any transmission or body control
- The ECU comes with calibration that is optimal for our engine, however please note that vehicle parameters such as gearing, tire size, vehicle weight, air intake, headers, etc. may necessitate additional tuning once installed into your specific vehicle.
- Included ECU is unlocked for further refinement at your local dyno shop if required.
Engine Break-In Procedure
Use or break-in oil or conventional (non-synthetic) multi-viscosity oil with zinc additive for the first 500 miles of operation. Avoid hard acceleration for sustained periods. Periodically change the engine speed while driving to help seat the rings. While the engine is running, be sure to check oil pressure and coolant temperature, and check for fluid leaks, such as oil, transmission fluid, fuel, and coolant/antifreeze. Also, listen for any unusual sounds. Should you hear an unusual sound, shut the engine off, check for the source, and correct it.
Engines with flat tappet cams only - Start the engine and bring it to 2,000 RPM. Get the engine running smoothly. Then vary the engine speed from 1,800-2,200 RPM in a slow acceleration/deceleration cycle for 30 minutes. This is necessary to provide adequate oil splash and lifter rotation to properly mate each lifter to its lobe.
At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil. After 6,000 miles, synthetic oils can be used in your engine. For flat tappet cam engines, continued use of oil with zinc or a zinc additive for the life of your engine is recommended.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Specifications:
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.