SERVICE MANUAL UPDATE-SEC. 6A1 OVERSIZE PISTON SPECIFICATIONS

Model and Year: 1987-88 TURBO SPECTRUM

This bulletin supersedes and replaces the "Oversize Piston Specifications" found on page 6A1-5 of the 1987 Spectrum Turbo Service Manual Supplement (ST 371-87S) and the 1988 Spectrum Service Manual (ST371-88).

Select Oversize Piston

Oversize pistons are available as listed. Replace the pistons in matched sets. Take the largest bore measured and select the oversize piston for the bore. Bore all cylinders for the oversize piston selected.

Oversize 0.50 77.460 - 77.470 mm (3.0496 - 3.0500 inches)

Oversize 1.00 77.960 - 77.970 mm (3.0693 - 3. 0697 inches)

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.