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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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15y ago
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13y ago

how tight do torgue specs need to be after insalling a intake gasket on a 2003 Chevy silverado

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