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Charts & Guides for Part Number MLL-BLS4273KB4L7
BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and 4L65/70E Trans Combos BLS4273KB4L7
Part Number: MLL-BLS4273KB4L7
BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and 4L65/70E Trans Combos
Engine and Transmission Combo, Builder Series LS427/605HP Standard, EFI, 4L65/70E, Includes Black Finish Accessory Drive System, Chevy, 7.0L LS, Kit
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Estimated Ship Date: Dec 17, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
BLS4273KB4L7
Part Type:
Product Line:
Summit Racing Part Number:
MLL-BLS4273KB4L7
UPC:
00887753983503
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:
No
Flexplate Included:
Yes
Flywheel Included:
No
Transmission Controller Included:
Yes
Torque Converter Included:
Yes
Wiring Harness Included:
Yes
Computer Included:
Yes
Quantity:
Sold as a kit.
Notes:
Oil pan has a rear sump.
Special Attention:
Includes a black finish accessory drive system with a LT1 water pump, type II power steering pump with reservoir, 150 amp LT1 style alternator, and a compact style air conditioning compressor.
BluePrint Builder Series LS427/605HP Standard Edition EFI Crate Engine and 4L65/70E Trans Combos
The BluePrint Builder Series LS427/605 hp Standard Edition EFI crate engine and 4L65/70E trans combo is a complete, ready-to-install engine and automatic transmission package for classic cars and hot rods. It features a powerful 427 cu. in. GM LS-style engine making around 605 hp with EFI—paired with a robust 4L65/70E automatic transmission, electronic controller, torque converter, and accessories for a simplified drivetrain swap. This kit takes the guesswork out of matching components, offering a high performance, dyno-tested solution with forged internals, aluminum heads, and modern fuel injection.
* Engine details (LS427/605 hp):
-- Displacement: 427 cu. in. (7.0L)
-- Horsepower/Torque: Around 605 hp / 565 lbs.-ft.
-- Block: BluePrint's high-strength cast iron LS-style block with enhanced strength
-- Rotating assembly: Forged crankshaft, forged connecting rods, forged pistons for durability
-- Cylinder heads: BluePrint aluminum heads with large intake/exhaust runners
-- Camshaft: Hydraulic roller cam
-- Fuel system: Complete electronic fuel injection (EFI) system, often with Holley's Terminator X
-- Compression ratio: 11:1
* Transmission details (4L65/70E):
-- Type: Heavy-duty automatic transmission (4L65E or 4L70E)
-- Controller: Includes an electronic transmission controller for proper shifting
-- Torque converter: Comes with a matching torque converter (around 2,200-2,400 rpm stall)
-- Flexplate: Non-weighted flexplate installed
* Package benefits:
-- Complete drivetrain: Comes fully assembled and bolted together
-- Simplified installation: Designed as a plug-and-play solution for swaps
-- Dyno tested: Engine performance is verified on a dyno, with results provided
-- Includes accessories: Often includes front accessories (alternator, power steering pump) and a swap-ready oil pan
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