For 1990-2009 cars

# SPECIFICATIONS FOR HEAD BOLT TORQUE

#### VEHICLES AFFECTED: 1987-88 ALL MODELS

This bulletin is being issued to give dealerships one source for engine head bolt specifications. These specifications are the most current listing available.

The entries under the heading "Torque Head Bolt To" is the "Torque To" for one complete pass thru the "Torque Sequence," when a second specification is listed, that should be used for a second pass thru the torque sequence listed. After completing the torque sequence(s) then proceed to the entries listed under "Rotate To Angle Of." This is the angle in degrees that each bolt should be rotated following the complete torque sequence. Each entry listed represents one pass thru the sequence.

LITER/ CUBIC BOLT TORQUE ROTATE VIN INCH/ NEW LUBE HEAD TO CODE/ FUEL BOLTS AND/OR BOLT ANGLE TORQUE TYPE SYS. REQ. SEALANT TO OF SEQUENCE ---- --- --- ------- -- -- -------- 6 1.6/98 Yes N/A 2 5 N.m 18 ft lb 60 8 4 1 5 9 L-4 TBI 60 7 3 2 6 10 30 K 2.0/122 Yes N/A 25 N.m 18 ft lb 60 8 4 1 5 9 L-4 TBI 60 7 3 2 6 10 30

M 2.0/122 Yes N/A 25 N.m 18 ft lb 60 8 4 1 5 9 L-4 MPFI 60 7 3 2 6 10 40

D 2.3/140 No Engine 48 N.m 35 ft lb 90 7 3 1 6 10 L-4 MPFI Oil 9 5 2 4 8

R,U 2.5/151 No 1-8 Oil 25 N.m 18 ft lb 90 10 6 2 3 9 L-4 TBI 9-10 34 N.m 25 ft lb 8 5 1 4 7 Use On All On All Sealer Exc #9 Exc #9 992545 Retorque Retorque Again To 25 N.m 18 ft lb

9 2.8/173 No Use 90 N.m 66 ft lb No 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 992545

W 2.8/173 No Use 45 N.m 33 ft lb 90 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 992545

S 2.8/173 No Use 55 N.m 40 ft lb 90 6 2 3 7 V-6 MPFI Sealer 5 1 4 8 992545

All Yes 34 N.m 25 ft lb 90 6 1 3 7 3.0L 90 8 4 2 5 3.8L V-6

F 5.0/305 No Use 82/102 60/75 No l3 5 2 10 V-8 MPFI Sealer N.m ft lb 17 9 1 6 14 992545 16 12 8 4 3 7 11 15

E 5.0/305 No Use 82/102 60/75 No 13 5 2 10 V-8 MPFI Sealer N.m lb ft lb 17 9 1 6 14 992545 16 12 8 4 3 7 11 15

Y 5.0/307 No Dip 122 N.m 90 ft lb No 7 5 1 3 9 V-8 MPFI Bolt Then Then 8 6 2 4 10 In Oil 130 ft lb 130ftlb

8 5.7/350 No Use 82 to 102 60/7 13 5 2 10 V-8 MPFI Sealer N.mb ft lb 17 9 1 6 14 992545 16 12 8 4 3 7 11 15

The illustration shows a typical head bolt pattern and torque sequence.

The position of the numbers listed under "Torque Sequence" indicate the approximate position of the head bolts in the cylinder head. 202b/3-4

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.