INTAKE PLENUM BOLT TORQUE REV. SERVICE MANUAL UPDATE

VEHICLES AFFECTED: 88 AND 89 FB YB 5.0L (VIN F) AND 5.7L (VIN 8) ENGINES

The intake manifold plenum/runner bolt torque specification has been revised for engines produced for the 1988 and 1989 model years. The new torque specification for the plenum/runner bolts is 34.0 N.m (25 lb.ft.). Service manuals should be changed to reflect this revision.

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.