Chevrolet Performance L8P 6.6L 523 HP / 543 LB-FT - Crate Engine

More Power from Chevrolet’s Largest LT-Series Engine

The L8P is Chevrolet’s highest displacement LT-series crate engine, developed to deliver significant low to mid range torque with enhanced high rpm power capability. Rated at 523 horsepower and 543 lb ft, the L8P provides a broad torque curve and increased airflow capacity, making it suitable for heavy duty builds, large displacement conversions and performance oriented custom projects that require robust bottom end strength.

This engine is based on the Gen V Small Block architecture but incorporates key changes over the L8T, including a higher lift hydraulic roller camshaft, uprated valvetrain components and revised induction characteristics. These upgrades increase airflow, improve combustion stability and yield a notable rise in peak power without sacrificing reliability.

Specifications

Engine Type: Gen V Small Block V8
Displacement: 400 cu in (6.6L)
Bore x Stroke: 4.065 x 3.860 in (103.25 x 98 mm)
Power: 523 hp at 5,800 rpm
Torque: 543 lb ft at 4,600 rpm
Compression Ratio: 10.8:1
Maximum RPM: 6,000

Engine Construction

• Cast iron block with six bolt nodular iron main bearing caps

• Forged steel crankshaft

• Forged powdered metal connecting rods

• Hypereutectic aluminium pistons

• Aluminium rectangular port cylinder heads with 59.02 cc chambers

• Composite intake manifold

• 87 mm single bore throttle body

Camshaft and Valvetrain

• Hydraulic roller camshaft

• Valve lift: 0.549 in intake / 0.549 in exhaust

• Duration at 0.050 in: 218 deg intake / 237 deg exhaust

• Investment cast roller trunnion rocker arms

• 1.81:1 rocker ratio

Advanced Features

• High pressure direct injection

• Coil on plug ignition system

• Continuously variable valve timing

• Premium pump fuel compatible

• 58x reluctor wheel

• Internal balancing

Installation Requirements

• Requires high pressure direct injection fuel pump installed

• Front End Accessory Drive System must be ordered separately and includes hydraulic power steering. Pulley mounted fans are not recommended

• Suits engines using the 19435224 Control Kit for 6L80 E transmissions. See manufacturer notes for 10L90 options

• Includes eight bolt flexplate

• Assembly does not include electronics, harness, oxygen sensors or Front End Accessory Drive components

Notes

The L8P crate engine includes the complete rotating assembly, induction and ignition hardware. Electronics, ECU, loom and FEAD components are not supplied. Designed for premium unleaded fuel.

This engine is intended for retrofit use in pre 1976 street vehicles or purpose built off road applications.