A Component Comparison from the Previous Year

WARNING: This page is about a different variant/trim than selected.

Exhaust gas recirculation (EGR) system has been deleted on all applications.
A spacer plate between the crankshaft and flywheel is required for applications using the 4L80-E transmission.
All 2004 applications use a piston with a graphite coated skirt.
The positive crankcase ventilation valve is a non-serviceable fitting on the left rocker arm cover.
The fuel rails for all engines except the L59 are returnless fuel systems. The fuel pressure regulator for those engines is now a part of the fuel pump module.
First design applications use a piston pin that is floating fit to the piston and press fit to the connecting rod. Second design applications use a piston pin that is full-floating to both the piston and connecting rod.
The first design piston, pin, and connecting rod are to be serviced as an assembly.