Blueprint Engines
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BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos BLS4273KBT56 427 c.i. LS Iron Block Edition, Fuel Injected, Manual w/ Black Pulley Kit
BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos BLS4273KBT56 427 c.i. LS Iron Block Edition, Fuel Injected, Manual w/ Black Pulley Kit
A$59,342.20
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Description
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 21:18:07
Features
Vehicle Compatibility and Return Conditions.
This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.
Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.
Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.
Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
Specifications
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Blueprint Engines |
| StreetFX SKU | mllBLS4273KBT56 |
| SFX Item ID | 5182913 |
| Accounting SKU | mll-BLS4273KBT56 |
| Manufacturer SKU | BLS4273KBT56 |
| Manufacturer UPC | 00887753983510 |
| Alternative References | BLS4273KBT56, MLL-BLS4273KBT56 |
Engine 427 c.i. LS Builder Series Iron Block Standard Edition, Fuel Injected, T56 Manual Transmission w/ Black Pulley Kit
BluePrint Builder Series LS427/605HP Standard Edition EFI crate engine and T56 transmission combos take the guesswork out of matching up an engine and transmission for your ride. Featuring a fuel injected Chevy LS small block-compatible 427 (c.i.d.) engine that produces 605 horsepower, this standard edition builder series includes a T56 manual transmission and pulley kit (pulley kit is an optional add-on, depending on the specific engine package you purchase). The aluminum BluePrint Engines cylinder heads help produce a nice 11.1 compression ratio, with assistance from the hydraulic roller camshaft, forged pistons, and forged crankshaft. Altogether, this assembly produces 565 lbs.-ft. of torque. When you need or want a new LS powertrain for your ride, go with the authority in crate engines and their BluePrint Builder Series LS427/605HP Standard Edition EFI crate engine and T56 transmission combos.
Other product features, items, and specifications:
• 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
• One-piece rear main seal
• 4.0665 in. bore
• Priority main oiling
• 6-bolt main
Rotating Assembly:
• Forged crankshaft
• Stroke – 4.125 in.
• Forged 6.125 in. connecting rods
• Forged pistons
• Internally balanced (front and rear)
Cylinder Heads:
• BluePrint cast aluminum PS8015 models
• Chamber – 70cc
• Valves are 2.165 in. intake and 1.600 in. exhaust
• Exhaust runners are 259cc intake and 102cc exhaust
Camshaft Specs:
• Hydraulic roller
• Intake valve lift – 0.624 in.
• Exhaust valve lift – 0.624 in.
• Intake duration at 0.050 in. of lift – 239
• Exhaust duration at 0.050 in. of lift – 255
• Lobe separation angle (LSA) – 114 degrees
Ignition Timing:
• ECM supplied calibration
Assembled T56 6-speed Transmission Package:
• McLeod Super Street Pro dual-disc clutch
• Steel Bell housing
• Billet flywheel
• Engine guard
• Starter
• Gear ratios are 2.66:1 (first), 1.78:1 (second), 1.30:1 (third), 1.00:1 (fourth), 0.80:1 (fifth), and 0.63:1 (sixth)
Other Components:
• MLL-BLS4273KBT56 and MLL-BLS4273KT56 engine/trans combos include front accessory drive with LT1 style 150-amp alternator, LT1 Style water pump, Type II power steering pump with baffled edges, and compact style A/C compressor
• Holley Terminator X Max - Gen IV Complete ECU/Harness EFI System
• LS Swap oil pan, windage tray, pickup screen
• BluePrint Engines fuel injectors and rail
• Low-profile swap oil pan
• DBW throttle body
• Throttle pedal, and sensors
• GM plastic intake manifold
• Spark plugs and wires
• Harmonic balancer
• Coil packs
Important Notes: 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. Engine/Trans Package ships assembled.
| Product Attributes | |
|---|---|
| Brand | BluePrint Engines |
| Manufacturer's Part Number | BLS4273KBT56 |
| Part Type | Engine and Transmission Combos |
| Product Line | BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos |
| UPC | 00887753983510 |
| Crate Engine Family | Chevy LS |
| Engine Assembly Style | Long block |
| Assembled | Yes |
| Intake Manifold Included | Yes |
| Carburetor Included | No |
| Throttle Body Included | Yes |
| Cylinder Heads Included | Yes |
| Cylinder Head Material | Cast aluminum |
| Distributor Included | No |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Spark Plugs Included | Yes |
| Spark Plug Wires Included | Yes |
| Flexplate Included | No |
| Flywheel Included | Yes |
| Transmission Controller Included | No |
| Torque Converter Included | No |
| Wiring Harness Included | Yes |
| Computer Included | Yes |
| Reluctor Wheel Tooth Quantity | 58 |
| Quantity | Sold as a kit. |
| Notes | Includes Holley Terminator X Max Gen IV complete EFI engine management system, harness, starter, drive-by-wire pedal and throttle body. Black front accessory drive system includes water pump, alternator, power steering pump, A/C compressor and all belts and pulleys. |
Compatibility
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