L8P 6.6L Complete Engine Asm 19541143

19541143 L8P 6.6L Chevrolet Performance Engine Assembly, Replaces 19435523

523hp @ 5,800 rpm and 543 lb/-ft @4,600 rpm

L8P: Modern Technology for Vintage Vehicles
We’ve optimized every cubic inch of our largest-displacement LT engine with the unique L8P performance crate engine. With 523 horsepower and 543 lb.-ft. of torque, this package combines the displacement and heavy-duty strength of our production-based L8T 6.6L engine plus a unique LT2-based camshaft.  It’s all rooted in the tough foundation of the L8T, with a forged steel crankshaft, high-strength parts, high-flow heads and composite intake manifold. We then add a more performance-oriented valvetrain, including valves, springs, and a unique non-AFM (Active Fuel Management) LT2-based camshaft. The net result is an increase of 122 horsepower and 79 lb.-ft. of torque over the production 6.6L engine. Our L8P crate engine package comes complete from the throttle body to the oil pan, including the PCV tube, evap tube, oil dipstick, oil fill tube and cap. It does not include the controller, harness, oxygen sensors or a Front-End Accessory Drive system.

INSTALLATION NOTES

• Engine is shipped with high-pressure direct-injection fuel pump installed
• Front End Accessory Drive system must be ordered separately and includes hydraulic power steering, with center pulley. Pulley-mounted fan
  not recommended. 
• Includes 8-bolt flexplate for automatic transmissions* See note below
• Use with Engine Control kit 19435524 (must use 6L80-E transmission)
• Not intended for marine applications
• Crankshaft has 8-bolt flywheel mounting pattern

• Use with the new engine control kit PN 19435524 with 6L80E transmission which includes a programmed controller, wire harness, pedal, oxygen sensors and mounts, MAD, Fuel Line Pressure Sensor and Fuel Pump Power Module (FPPM).
• Use with the new engine control kit PN 19540996 for 10L90E transmission which includes a programmed controller, wire harness, pedal, oxygen sensors and mounts, MAD, Fuel Line Pressure Sensor and Fuel Pump Power Module (FPPM).
• Flexplate PN 12685003 may be preinstalled and should work with the 6L80E Transmission. Use PN 12670976 Flexplate with the 10 speed supermatic transmission.
• Passenger car style accessory drive systems coming soon. PN 19540199 with A/C, and 19540200 without A/C. (call us for availability at 847-276-8110)
  *Note: Flexplate may need to be swapped out when used with a 10 Speed Transmission. Use PN 12670976

Link to Installation Guide

Note: There are two different Chevrolet pilot bearings for the L8T and L8P. 14061685 is for a long input shaft transmission and 12557583 is for a short input shaft transmission. Verify fit prior to installing the transmission or damage will occur.