Some 2.0L L4 engines may have been produced with 0.26m oversize tappet bores. The oversize tappet bore is identified with a vertical stripe of white paint on both sides of the tappet bore inside the tappet cavity. In addition, the cylinder block has a steel stanp with ".26 OS" on the top right front maching pad. If one of the oversize hydraulic valve lifters requires replacement, use part nunber 5233545.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.