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BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos BLS4273KT56 427 c.i. LS Iron Block Edition, Fuel Injected, Manual w/ Polished Pulley Kit

SKU: MLLBLS4273KT56

Engine and Transmission Combos

BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos BLS4273KT56 427 c.i. LS Iron Block Edition, Fuel Injected, Manual w/ Polished Pulley Kit

SKU: MLLBLS4273KT56

Engine and Transmission Combos
A$59,152.88
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

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.

Part Type

Engine and Transmission Combos

Data: v4.2 - Upd: 2026-09-27 14:39:24

Specifications

Product Attributes - Brand
BluePrint Engines
Product Attributes - Manufacturer's Part Number
BLS4273KT56
Product Attributes - Part Type
Engine and Transmission Combos
Product Attributes - Product Line
BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and T56 Transmission Combos
Product Attributes - UPC
00887753983534
Product Attributes - Crate Engine Family
Chevy LS
Product Attributes - Engine Assembly Style
Long block
Product Attributes - Assembled
Yes
Product Attributes - Intake Manifold Included
Yes
Product Attributes - Carburetor Included
No
Product Attributes - Throttle Body Included
Yes
Product Attributes - Cylinder Heads Included
Yes
Product Attributes - Cylinder Head Material
Cast aluminum
Product Attributes - Distributor Included
No
Product Attributes - Oil Pan Included
Yes
Product Attributes - Valve Covers Included
Yes
Product Attributes - Timing Cover Included
Yes
Product Attributes - Water Pump Included
Yes
Product Attributes - Harmonic Balancer Included
Yes
Product Attributes - Spark Plugs Included
Yes
Product Attributes - Spark Plug Wires Included
Yes
Product Attributes - Flexplate Included
No
Product Attributes - Flywheel Included
Yes
Product Attributes - Transmission Controller Included
No
Product Attributes - Torque Converter Included
No
Product Attributes - Wiring Harness Included
Yes
Product Attributes - Computer Included
Yes
Product Attributes - Reluctor Wheel Tooth Quantity
58
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Notes
Includes Holley Terminator X Max Gen IV complete EFI engine management system, harness, starter, drive-by-wire pedal and throttle body. Polished front accessory drive system includes water pump, alternator, power steering pump, A/C compressor and all belts and pulleys.

Reference Information

Brand Name/s Blueprint Engines
StreetFX SKU mllBLS4273KT56
SFX Item ID 5182849
Supplier Item Code 5182849
Manufacturer SKU BLS4273KT56
Manufacturer UPC 887753983534
Alternative References LS427/605HP, T56

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyCHEVY SMALL BLOCK GEN III/IV LS V8 GAS
    Fuel Delivery TypeFuel injection
    TransmissionManual
    Transmission Manufacturer CodeTremec T56 Magnum

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