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Torque specs for the Chev. 3.1 intake manifolds are as follows:
Lower Intake Manifold
Center bolts
Step 1 - 62 in-lbs
Step 2 - 115 in-lbs
Corner bolts
Step 1 - 115 in-lbs
Step 2 - 18 Ft-lbs
Upper Intake Manifold
Bolts & Studs - 18 Ft-lbs
Specs are taken from Hayes Repair Manual: Chevrolet: Lumina, Monte Carlo, & Impala (FWD) 1995 thru 2005
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