Chevrolet Performance 19434650 Gen III LS364/450 LS Crate Engine

The Chevrolet Performance LS long block is a high-performance solution for enthusiasts seeking a powerful upgrade or a robust foundation for a new build. Engineered with proven technology, this engine delivers exceptional horsepower and a broad torque band, making it ideal for retrofitting older LS-equipped vehicles or custom projects. Its advanced design incorporates a fuel injection system and supports the transfer of existing induction components or custom configurations, offering flexibility to suit your needs.

Key Features

• Exceptional value for high-performance LS upgrades or new builds

• Delivers strong horsepower with a wide torque range

• Designed for seamless retrofit into older LS-equipped vehicles

• Supports fuel injection for enhanced efficiency

• Allows reuse of existing induction components or custom builds

Technical Overview

Introduced in 1997, the LS engine series, known as the Gen-III Small-Block by General Motors, debuted with the all-aluminum LS1 in the C5 Corvette and iron-block variants in trucks. Subsequent iterations, referred to as Gen III and Gen IV, have earned the "LS" nickname among enthusiasts for their remarkable performance potential. Chevrolet Performance Parts are meticulously engineered, developed, and tested to surpass expectations for fit, function, and durability, embodying innovation beyond raw power.

This long block features a 24X crankshaft trigger and 1X camshaft trigger system, compatible with Gen III small-block V8 engines produced from 1997 to 2006. This design enables straightforward replacement in existing Gen III applications, allowing customers to reuse sensors, exhaust systems, and engine mounts from their current setup. The long block incorporates high-flow rectangular cylinder head intake ports, originally used on Gen IV LS3 engines, which outperform the intake ports of earlier Gen III engines. To accommodate these heads, a new intake manifold from a Gen IV vehicle (6.0-6.2L) with rectangular intake ports is required.

• Part Number: 19370163
• Engine Type: Performance LQ9 long block
• Displacement (cu in): 364 cu in (6.0L)
• Bore x Stroke (in): 4.000 x 3.622 in (101.6 x 92 mm)
• Block: Cast iron with 6-bolt block, cross-bolted main caps
• Crankshaft: Nodular iron
• Connecting Rods: Powdered metal
• Pistons: Hypereutectic aluminum
• Camshaft Type (P/N 12565308): LS6 hydraulic roller
• Valve Lift (in): 0.550 intake / 0.550 exhaust
• Camshaft Duration (@.050 in): 204° intake / 218° exhaust
• Cylinder Heads: LS3 rectangular port; aluminum, as-cast with 68cc chambers
• Valve Size (in): 2.165 intake (hollow stem) 1.590 exhaust (solid stem)
• Compression Ratio: 10.3:1 (nominal)
• Rocker Arms: Investment cast, roller bearing trunnion
• Rocker Arm Ratio: 1.7:1
• Recommended Fuel: Premium pump
• Maximum Recommended rpm: 6,800
• Reluctor Wheel: 24X
• Balanced: Internal