Chevrolet Performance LS 376/515 LS3 Long Block Crate Engines 19370412

Chevrolet Performance's LS 376/515 (part 19370412) takes a stock 430-horsepower LS3 and builds in a more aggressive camshaft, lifting output to 515 horsepower; peak torque of 483 lb-ft arrives lower in the rev range, while horsepower peaks up near 6,600 rpm. The underlying 6.2L, 376 cubic inch aluminum architecture stays unchanged.

What the more aggressive cam buys you

Higher lift and longer duration than a stock LS3 cam is what moves output from 430 to 515 horsepower, and Chevrolet Performance pairs that cam with a carbureted intake manifold already installed, letting you run a simplified carbureted fuel system instead of factory electronic fuel injection while retaining LS-architecture power.

What is and is not included

The water pump, harmonic balancer, timing cover, oil pan, valve covers, and spark plugs are all fitted at the factory, but the carburetor, throttle body, distributor, flywheel, flexplate, computer, and wiring harness are excluded and must be sourced to match your build. Compression is 10.7:1, so plan on premium fuel.

Common questions

How is this different from a standard LS3? The camshaft profile does the work, taking a stock engine's 430 horsepower up to 515. Is this suited to a classic muscle car swap? Yes, the carbureted intake setup is intended to simplify exactly that kind of installation, and it pairs well with drag and pro-touring builds that already run carburetors. Do I need a specific flexplate or flywheel? Neither is included, so pick one that matches the transmission going behind this long block.

Specifications