GENUINE GM LT4 High Pressure Fuel Injection Pump - 12711668This is the factory LT4 high pressure fuel pump (HPFP). Cross references to 12688607, 12694529. Part Number: 12711668 Description: Mechanical fuel pump flow has been one of the primary limiting factors for the aftermarket when trying to increase the power output of the GM direct injection V8 engines. The OEM LT4 HPFP is the highest flowing factory HPFP pump option available for the Gev V LT applications and is a common upgrade for LT1, L83 and L86

Note: This system is designed to work with the Speed Engineering longtube headers only

Capacity: 7 fluid ounces

and Escalade

The 1200 kit uses an oil fill cap adapter which will require a hole in the coil cover on wet sump models

FAST LSXHR - (CATHEDRAL-103mm) BLACK 146303

and a chamfered surface for large radii crankshafts

Texas Speed & Performance (TSP) Stage II Low Lift Truck Camshaft Specs (25-TSPLL212218112): 212/218

3L - 12689035GM Part # 12689035

but more meaningfully

That was a must have to make the pickup truck sit level

it must be carefully aligned with the block

Multiple spring rate options are also available and have been successfully tested in various applications