For 1990-2009 cars

# INTAKE MANIFOLD GASKET CORROSION INFORMATION

A NEW DESIGN INTAKE MANIFOLD GASKET FOR THE 4.3L (260 CID) ENGINES WENT INTO PRODUCTION APPROXIMATELY MAY, 1980. THE NEW DESIGN GASKET SHOULD CORRECT ANY CORROSION CONDITION OF THE ALUMINUM INTAKE MANIFOLD THAT MAY BE ENCOUNTERED. THE NEW DESIGN GASKET PART NUMBER 557865 IS AVAILABLE FROM GMWDD.

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.