The LS1 was a milestone in efficiency, performance, and power. Then, the GM engineers outdid themselves by taking the LS1 to the next level with a bigger cam, intake, and more compression. We call this amazing 350 cubic inch small-block the LS6, and you’ll see the LS6 as standard equipment in the amazing C5 Corvette Z06 and Cadillac CTS-V. Together with the sophisticated engineering from GM, these two cars utilize the LS6 small-block to dominate their class.

The 5.7L LS6 builds on the inherent strengths of the LS1 engine, but benefits from a higher-lift camshaft and higher-compression pistons to raise horsepower from 350 to 405, and torque from 340 lb.-ft. to 400 lb.-ft. Such tremendous power is produced through the use of hollow-stem valves, a more aggressive camshaft, an improved intake, and higher-rate valve springs.

GM Performance Parts delivers the LS6 as an all-inclusive assembly, complete with CTS-V aluminum oil pan, larger-volume composite intake manifold with single-bore throttle body, and high-performance log-style exhaust manifolds.

The LS6 has helped to take the C5 Z06 Corvette and the Cadillac CTS-V to new levels of performance. Let the same General Motors engineering, testing, and horsepower take you to a higher level of performance.

Part Number: 17801268

Engine Type: LS Series small-block V-8

Displacement (cu in): 346 (5.7L)

Bore x Stroke (in): 3.90 x 3.62 (99 x 92mm)

Block (P/N 12561166): Cast aluminum with 6-bolt,
cross-bolted main caps

Crankshaft (P/N 12583565): Nodular iron

Connecting Rods (P/N 12577583): Powered metal steel

Pistons (P/N 88984245): Hypereutectic aluminum

Camshaft Type (P/N 12565308): Hydraulic roller

Camshaft Lift (in): .550 intake / .550 exhaust

Camshaft Duration (@.050 in): 204° intake / 218° exhaust

Cylinder Heads (P/N 12564825): Aluminum, cathedral port

Valve Size (in): 2.00 intake / 1.55 exhaust

Compression Ratio: 10.5:1

Rocker Arms: Investment cast, roller trunnion

Rocker Arm Ratio (P/N 10214664): 1.7:1

Recommended Fuel: 92 octane

Maximum Recommended rpm: 6500

Reluctor Wheel: 24X

Balanced: Internal

GM Performance Parts Crate Engines include a 24-month or 50,000-mile/80,000-kilometer limited warranty.

* Without ECU and Harness
* For a shipping quote, please contact us