NRE Twin-Turbo Alien LS 427

Power Output:

• 1,650 HP on race fuel

• 1,270 HP on pump gas

The NRE Twin-Turbo Alien LS 427 is a fully engineered, street-capable twin-turbo LS engine designed to deliver extreme power without sacrificing drivability or reliability. This package was developed as a true turn-key solution, capable of long-distance cruising, daily usability, and sustained high-output performance.

Built to comfortably cruise at low RPM on the freeway while retaining the ability to produce well over 1,500 horsepower, this engine balances power, durability, and refinement. The result is a twin-turbo LS that behaves like a street engine when required, yet delivers race-level output on demand—while retaining the unmistakable character of a high-performance hot rod.

Performance Overview

• Displacement: 427 cubic inches

• Induction: Twin turbocharged

• Maximum Output:

  • 1,650 HP (race fuel)

  • 1,270 HP (pump gas)

• Fuel Compatibility: Pump gas and race fuel

• Engine Type: Turn-key, street-capable twin-turbo LS

Engine Specifications

Block & Rotating Assembly

• Block: Dart LS Next

  • 4.125″ bore

  • 9.240″ deck

  • Steel splayed main caps

  • Six head bolts per cylinder

• Crankshaft: Dart billet, 4.0″ stroke

• Connecting Rods: Boostline 6.125″, 4340 forged I-beam

• Pistons: Custom JE forged 2618 alloy, 9.0:1 compression

Valvetrain & Timing

• Camshaft: Custom NRE hydraulic roller

• Lifters: GM Racing roller lifters

• Rocker System: Comp Cams shaft rockers

• Pushrods: Manton Series 5

• Rocker Arms: Bushed LS3

• Ignition Trigger: 60-2 tooth crank trigger

Cylinder Heads & Sealing

• Cylinder Heads: NRE AFR 260cc LS3

• Configuration: Six-bolt, fully CNC-ported

• Head Gaskets: Cometic MLX

• Fasteners: ARP throughout

Induction & Fuel System

• Intake Manifold: Shauns full billet intake

• Throttle Body: 90 mm drive-by-wire

• Fuel Injectors: Custom flow-matched 1,200 cc

• Engine Management: Holley Terminator ECU

  • Complete wiring harness and sensors included

Turbo & Exhaust System

• Turbochargers: NRE 72 mm mirror-image Gen 2 billet wheel

• Wastegates: Precision 46 mm V-band

• Headers: Stainless steel 304, fully TIG-welded

Lubrication & Hardware

• Oil Pump: High-volume

• Oil Pan: Moroso 7-quart road race pan with trap doors

• Additional Oil System: Holley 302-3

• Valve Covers: NRE billet, fully CNC-machined

Key Characteristics

• Street-capable twin-turbo LS platform

• Long-distance cruising capability with extreme power reserves

• Fully assembled and dyno-tested turn-key engine

• High-quality components selected for durability at elevated power levels

• Balanced combination of drivability, value, and output

Typical Applications

• High-power street cars

• Pro-touring and restomod builds

• Drag and roll-racing platforms

• LS swap projects requiring reliable twin-turbo performance