11/21/2012
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Revised Cylinder Head Bolt Torque Specification and Tightening Sequence for GM 3.1L and 3.4L Engines
There is a revised cylinder head bolt torque and tightening sequence for 1994-2002 GM 3.1L and 3.4L engines.
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.