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Posted on Jan 02, 2017
Hi El Faraon,
I believe that you're dealing with 12 mm bolts and nuts....THESE ARE NOT THE SPECS FOR YOUR ENGINE, but I believe that if you use them you'll be close....Tighten in three stages up to 22nm....choose the bolts from the centre of the manifold and circle outwards until you reach the last one.....It may be a good idea to draw an overhead or plan view of the unit, marking out the bolt positions.....Start at the centre and mark the sequence and follow that....What is important is starting at the centre, so that nothing becomes warped....
Hope this helps,
Posted on Sep 06, 2008
Lower intake bolts 11 ft. lbs start in the center of the intake and work your way out cross from side to side.Tighten the upper intake bolts with the same procedure with 89 inch pds.Be sure to apply threadlocker to the lower intake bolt threads.
Posted on Feb 07, 2010
attached is the picture of the torque sequence for bolts and the torque specs. as u can see different bolts have diff specs for torque
Posted on May 07, 2010
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Fig. 1: Intake manifold installation-4.3L engines (click over image for zoom)
Fig. 2: Intake manifold bolt tightening sequence-1996-98 4.3L engines
Install the bolts and tighten in sequence and in 3 steps as follows:
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Fig. Intake manifold bolt torque sequence 2.7L engine
Upper intake manifold with a new gasket on the lower intake manifold and torque the bolts, in sequence, to: 105 inch lbs. (12 Nm)
Hope helps (remember to rate this answer). Good job.
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