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Revised Cylinder Head Bolt Torque Specification and Tightening Sequence for GM 3.1L and 3.4L Engines

November 21, 2012

The revised specification is as follows:

• Tighten the cylinder head bolts to 44 ft.lbs (60 N-m) in the order shown in illustration. Use the J 36660-A torque angle meter in order to rotate the cylinder head bolts an additional 95 degrees.

Tighten the bolts in sequence to the the specified torque. With all the bolts tightened, make a second pass tightening all the bolts an additional 95°. Remember, 95° is just a little more than a 1/4 turn, not 1/2 turn, or from 12 o'clock to 3 o'clock on the dial. Do not tighten beyond this specification, otherwise the bolts will be overstressed and the gaskets may suffer damage.

Some or all of this information was provided by the Automotive Parts Remanufacturers Association (APRA). For more information on technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com.

 
 
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