(step 1 ) the torque specs for the heads are---1998 through 2001 are 37 foot lbs. ( step 2) rotate an additional 90-degrees (1/4 turn). intake manifold bolts ( lower ) step 1-- 62 in-lbs, step 2--115 in-lbs. intake manifold bolts/studs ( upper ) 18 ft-lbs. this is for the 3.1 v-6, have a good day!
I don't think that the specs for the upper intake is 16 ft lbs for 2000 Chevy Malibu. I replaced the intake gaskets and while performing the torque for the upper intake, it broke from the ends where the bolts are tightened.
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