DIESEL ENGINE HEAD BOLT REPLACEMENT INFORMATION

VEHICLES AFFECTED: ALL VEHICLES EQUIPPED WITH THE 5.7L V8 DIESEL ENGINE (ENGINE VIN CODE N) THE OLD STYLE DIESEL ENGINE HEAD BOLTS MAY STRETCH WITHOUT BREAKING RESULTING IN INSUFFICIENT TORQUE AT THAT BOLT. THE NEW STYLE BOLT, IDENTIFIED BY A DASH (-) ON THE BOLT HEAD IS OF SUFFICIENT HARDNESS THAT STRETCHING OF THE BOLT WILL NOT OCCUR. THE NEW STYLE BOLT DOES NOT REQUIRE REPLACEMENT WHEN A CYLINDER HEAD IS REMOVED FOR SERVICE UNLESS IT IS BROKEN.

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.