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I have a 2003 Chevy impala 3400 or 3.4 L. I Need to find the upper intake torque specs, lower intake torque, and the rockerarm torque specs. Can anyone help me
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Use a skin coat of RTV silicone on both sides of the water passage ports (outer most holes) and put the new lower intake gaskets into place
Hand tighten the 13mm head intake bolts and Torque the bolts , starting from the center and working your way out in a circular pattern
Torque these bolts in a few small increments until they have reached 250 inch pounds of torque.
Upper Intake Plenum:
When installing the intake air plenum , be sure to catch the four center bolts and the two side bolts (stiffener brackets) before tightening , The center bolts should be torqued to 250 inch pounds .The fuel rail bolts should be torqued to 100 inch pounds
starting at the middle bolt and go directly across then criss cross the pattern like you would tightening wheel nuts, towards the outside(end) bolts. if this is a plastic upper intake the torque should be around 15ft lbs if its metal around 25ft lbs.
(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!
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