Chevrolet Performance LS3 525 HP Long Block Crate Engines 19432629

This Chevrolet Performance LS3 (part 19432629) is the EFI-ready entry in the 525-horsepower LS3 lineup, arriving with its fuel injection system and throttle body already installed rather than left for the builder to source; torque reaches 486 lb-ft lower in the rev range than peak power does.

What sets this LS3 apart from the long-block-only version

Unlike a bare LS3 long block, this engine ships with its intake manifold, fuel-injection throttle body, water pump, and spark plugs already fitted, alongside an already-mounted harmonic balancer, valve covers, timing cover, and oil pan, giving you most of a running EFI engine rather than a platform you build induction onto from scratch.

What is still excluded

The flywheel, flexplate, wiring harness, and ECU are not part of this package; source these new or carry them over from your current engine instead. This engine is built around EFI and is not designed for carbureted fuel systems without modification, so plan your fuel system around electronic injection from the start.

Running it right

What fuel does it need? Premium at 91 octane or higher, given the 10.7:1 compression ratio shared across this LS3 family. Is this suitable for street use? Yes, Chevrolet Performance positions it for street performance, restomods, and track cars with a modern EFI-compatible drivetrain and ECU already in place. Can I run it carbureted instead? No, not without significant modification to the fuel system.

Specifications