BluePrint GM LS3-Compatible Long Block Crate Engine – 376 c.i. – 530 HP
PSLS37630CT
530 HP · 495 lb-ft · 376 c.i. · 91+ Octane · Dyno Tested · 30-Month/50,000-Mile Warranty
Built for builders who want serious naturally aspirated LS performance without starting from scratch, this GM LS3 Compatible 376 Crate Engine delivers 530 horsepower and 495 lb-ft of torque in a durable long block package. Designed around a high-strength LSX-style cast iron block, this engine combines proven LS reliability with upgraded internal components capable of handling aggressive off-road, street, and racing applications.
Whether you're completing an LS swap, building a rock crawler, Ultra4 car, prerunner, muscle car, hot rod, or custom truck, the 376 cubic inch displacement offers an excellent balance of horsepower, torque, drivability, and reliability. The hydraulic roller cam and high-flow aluminum cylinder heads provide a broad powerband while maintaining excellent street manners.
As a long block configuration, this engine is not a turnkey or base-dressed engine. It gives builders the flexibility to choose their own intake manifold, fuel injection system, ECU, wiring harness, accessories, and exhaust components. It's an excellent option for custom projects where complete control over the engine management system is desired.
Need to confirm fitment or get an exact delivered price? Call or text our team before ordering.
Includes
- GM LS Compatible 376 Long Block
- Aluminum Cylinder Heads
- Hydraulic Roller Camshaft
- LS Valve Covers
- LS Swap Oil Pan
- Harmonic Balancer
Note: Intake manifold, throttle body, injectors, fuel rails, ECU, wiring harness, flexplate/flywheel, starter, front accessory drive, ignition coils, spark plugs, and exhaust components are NOT included
Specifications
| Specification | Details |
|---|---|
| Engine Family | GM LS Compatible |
| Displacement | 376 Cubic Inches |
| Horsepower | 530 HP |
| Torque | 495 lb-ft |
| Compression Ratio | 10.7:1 |
| Block Material | High-Strength Cast Iron (LSX Style) |
| Bore | 4.0662" |
| Stroke | 3.622" |
| Main Caps | 6-Bolt |
| Rear Main Seal | One-Piece |
| Oiling System | Priority Main Oiling |
| Crankshaft | Nodular Iron |
| Connecting Rods | 6.125" Forged Steel |
| Pistons | Hypereutectic Flat Top |
| Balance | Internal |
| Cylinder Heads | Aluminum |
| Combustion Chamber | 69cc |
| Intake Valve | 2.165" |
| Exhaust Valve | 1.590" |
| Camshaft | Hydraulic Roller |
| Cam Lift | .612" Intake / .585" Exhaust |
| Cam Duration @ .050 | 225° Intake / 238° Exhaust |
| Lobe Separation | 113° |
| Fuel Requirement | 91+ Octane |
| Oil Capacity | 6 Quarts |
Fitment Notes
- Designed for custom LS swap projects.
- Compatible with most GM LS engine mounts and accessory systems.
- Accepts OEM LS3 front and rear covers.
- Requires an intake manifold, throttle body, fuel system, ECU, and wiring harness.
- Compatible with many popular GM manual and automatic transmissions including TH350, TH400, 4L60E, 4L80E, Powerglide, and Magnum manual transmissions when the appropriate bellhousing and flexplate/flywheel are used.
- Custom tuning is required.
Tech Insight
The 376 cubic inch LS3 has become one of the most popular crate engines for off-road builders because it delivers an excellent combination of horsepower, torque, reliability, and aftermarket support. The cast iron LSX-style block offers significantly greater strength than factory aluminum blocks, making it an excellent choice for vehicles that see severe vibration, repeated shock loads, and sustained high RPM operation.
A long block also gives builders complete flexibility when selecting an engine management system. Whether you're using a Holley Terminator X, FuelTech, Haltech, or a factory GM ECU, you can build the engine package around your specific project instead of paying for components you don't intend to use.
Frequently Asked Questions
What is included with a long block?
This engine includes the assembled engine block, rotating assembly, camshaft, timing components, cylinder heads, valve covers, oil pan, and harmonic balancer. Intake components, fuel system, ignition system, ECU, and wiring are sold separately.
What is the difference between a long block and a turnkey engine?
A long block requires the builder to supply the intake system, engine management, wiring harness, fuel system, ignition components, and accessories. A turnkey engine includes nearly everything required to run.
Is this a good engine for an LS swap?
Yes. The 376 LS is one of the most popular engines for Jeep swaps, rock crawlers, muscle cars, classic trucks, hot rods, race cars, and custom off-road vehicles because of its power, reliability, and massive aftermarket support.
