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

Overview Harness four-digit horsepower potential with this LME-built, Speed master-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. Specs Brand: Speed master Part Number: PCE284.1019Part Type: Crate Engine Engine Assembly Style: Complete Crate Engine Cylinder Head Material: Aluminum (CNC-ported)Assembled: Yes Engine Balance: Internal Intake 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)Flex plate Included: No Flywheel Included: No Air Cleaner Included: No Spark Plugs Included: Yes Spark Plug Wires Included: No Computer Included: No Wiring Harness Included: No Rear Main Seal Style: 1-pieceQuantity: Sold individually. Notes: Fully assembled 402ci LS-based crate engine built by Late Model Engines with Speed master 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. Description Performance Testing & Results This 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 RPM torque: 629 lb.-ft @ 5300 RPM Chevy LS 402ci LME-built crate engine with 6-71 supercharger dyno graph Dyno Video Key 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 Speed master 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, Wesco 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 installation. Why 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 upgrades What’s Included A 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 included Applications Pro-touring builds needing instant torque and drivability Classic muscle cars upgrading to modern LS power with vintage blower style High-end rest mods and custom hot rods Street/strip vehicles aiming for four-digit horsepower Precision CNC Machining – Built by LMEE very LME-built engine undergoes meticulous CNC machining to ensure exact tolerances and maximum performance. Fully CNC-ported intake and exhaust runners for optimal airflow Hand-blended combustion chambers for improved efficiency and detonation resistance Diamond-honed cylinder bores with torque plates for perfect ring seal Precision decking, line honing, and balancing for long-term durability LME CNC ported cylinder head and precision machining

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