Speedmaster LS 402 Cubic Inch 1000 HP LME-Built Complete Crate Engine with 6-71 Supercharger

OverviewHarness four-digit horsepower potential with this LME-built, Speedmaster-equipped 402ci LS blown crate engine. Precision-machined, balanced, and blueprinted for high boost reliability, this package combines forged internals, CNC-ported heads, and a polished 6-71 supercharger for instant torque and massive power on demand.SpecsBrand: SpeedmasterPart Number: PCE284.1019Part Type: Crate EngineEngine Assembly Style: CompleteCrate Engine Cylinder Head Material: Aluminum (CNC-ported)Assembled: YesEngine Balance: InternalIntake Manifold Included: Yes (CNC-machined billet LS3 blower intake)Cylinder Heads Included: Yes (CNC-ported LS3/L92 style heads)Carburetor Included: No (requires EFI or carb setup compatible with blower)Throttle Body Included: No (blower-specific top plate)Distributor Included: n/a (coil-near-plug ignition)Oil Pan Included: Yes (LS swap wet sump pan)Valve Covers Included: Yes (polished aluminum)Timing Cover Included: Yes (polished front 2-piece with cam sensor port)Water Pump Included: Not included (requires compatible LS water pump)Harmonic Balancer Included: Yes (SFI 18.1 rated, 10% underdrive)Flexplate Included: NoFlywheel Included: NoAir Cleaner Included: NoSpark Plugs Included: YesSpark Plug Wires Included: NoComputer Included: NoWiring Harness Included: NoRear Main Seal Style: 1-pieceQuantity: Sold individually.Notes: Fully assembled 402ci LS-based crate engine built by Late Model Engines with Speedmaster performance components. Features a polished 6-71 roots-style blower, CNC-ported aluminum heads, forged rotating assembly, and premium valvetrain. Dyno-tested to 768 HP at just 7 psi on pump gas (93 octane) and capable of 1000 HP when run on methanol.DescriptionPerformance Testing & ResultsThis engine has been fully dyno-tested and documented for both pump gas and methanol configurations.Pump Gas (93 Octane) - 7 psi Boost:Horsepower: 768 HP @ 6900 RPMTorque: 629 lb-ft @ 5300 RPMChevy LS 402ci LME-built crate engine with 6-71 supercharger dyno graphDyno VideoKey Highlights 402 cubic inches from a 4.005" bore x 4.000" stroke Built by Late Model Engines (LME) - industry leader in high-performance LS builds Speedmaster 6-71 roots blower for instant boost and torque delivery Dyno-proven: 768 HP @ 7 psi on pump gas (93 octane) - 1000 HP on methanol Forged rotating assembly: 4340 steel crankshaft, I-beam connecting rods, Wiseco forged pistons with coated skirts CNC-ported aluminum heads LS3/L92 architecture with premium competition valve job High-performance valvetrain: Johnson tie-bar hydraulic roller lifters, CHE trunnion upgrade, double valve springs set for high-lift cams Custom hydraulic roller camshaft optimized for boosted street/strip use SFI 18.1-rated harmonic balancer with blower drive integration Complete long-block - ready for accessories and installationWhy Choose This Engine? Complete performance - built, tested, and ready to install Proven performance - near 800 HP on pump gas at low boost Race-proven machining - LME's proprietary processes ensure power and reliability Show-stopping looks - polished blower, billet drive, and CNC intake Massive power potential - pump gas or methanol-ready Longevity under boost - forged rotating assembly, premium bearings, and high-lift valvetrain components Boost-ready internals - supports higher boost levels for future upgradesWhat's IncludedA complete premium build from block to blower: Fully machined, balanced, and blueprinted 402ci LS Gen IV 6-bolt main block Forged crankshaft, rods, and pistons engineered for high boost CNC-ported aluminum heads matched to blower application Polished 6-71 roots-style supercharger system with billet intake LS swap wet sump oil pan Dyno break-in, performance verification, and documentation includedApplications Pro-touring builds needing instant torque and drivability Classic muscle cars upgrading to modern LS power with vintage blower style High-e

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