Speedmaster®
Chevy LS 402ci 1000HP LME-built Complete Crate Engine with 6-71 Supercharger
Overview
Harness 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.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE284.1019 |
| Part 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) |
| Flexplate 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-piece |
| Quantity: | 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. |
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
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
- 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 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 restomods and custom hot rods
- Street/strip vehicles aiming for four-digit horsepower
Precision CNC Machining - Built by LME
Every 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
Brand Information
In 1979, the company was founded with Pete's Performance, which was a small speed workshop. It began by building engines for customers as a hobby, and it has now grown to include selling, assembling, manufacturing and racing high performance engine parts. Over the years, the company has grown into a worldwide high performance powerhouse. Growing from a one-man bricks-and-mortar business; to now a supply chain in which entails more than 400+ people all across the world. Today, Pete's Performance has evolved into the internationally known Speedmaster: which has distribution centres and offices is Sydney, Los Angeles and Shanghai.
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.