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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how tight do torgue specs need to be after insalling a intake gasket on a 2003 Chevy silverado
35 ft. lbs.
They are under the intake manifold.
There are two knock sensors located in the block. They are just under the intake manifold.
It goes to the temp gauge which is usually screwed in the head between the manifold on the drivers side, or into the thermost housing on the intake manifold.
The intake manifold gaskets have failed on many of the V6 and V8 Chevy and GMC trucks in our fleet. The replacement gaskets are a better design that the original.