Ps the 11 lbs is correct, below is how I did mine (see link)

Notice: Apply the proper amount of the sealant when assembling this
component. Excessive use of the sealant can prohibit the component from sealing
properly. A component that is not sealed properly can leak leading to extensive
engine damage.

Important: The lower intake
manifold must be installed and the fasteners tightened while the adhesive is
still wet to the touch.


1.
Apply a 4.0 mm (0.157 in) patch of adhesive
GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the
cylinder head side of the lower intake manifold gasket at each
end.

2.
Install the lower intake manifold gasket onto
the cylinder head.
Use the gasket locator pins in order to properly seat the lower intake
manifold gasket onto the cylinder
head.

Notice: Apply the proper amount of the sealant when assembling this
component. Excessive use of the sealant can prohibit the component from sealing
properly. A component that is not sealed properly can leak leading to extensive
engine damage.

Important: All sealing
surfaces must be clean, free of oil, dirt, or any other foreign material.

3.
Apply a 5 mm (0.197 in) bead of adhesive
GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the
front top of the engine block.

4.
Extend the adhesive bead 13 mm (0.50 in) onto
the each lower intake manifold
gasket.

5.
Apply a 5 mm (0.197 in) bead of adhesive
GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the
rear top of the engine block.

6.
Extend the adhesive bead 13 mm (0.50 in) onto
each lower intake manifold
gasket.

7.
Install the lower intake manifold onto the
engine block and the cylinder heads.

Notice: Refer to
Fastener Notice
in Cautions and Notices.

8.
Apply threadlock GM P/N United States 12345382,
GM P/N Canada 10953489, or equivalent, to the threads of the lower intake
manifold bolts.

Notice: Proper lower intake manifold fastener tightening sequence and torque
is critical. Always follow the tightening sequence, and torque the intake
manifold bolts using the 3 step method. Failing to do so may distort the
crankshaft bearing bore alignment and cause damage to the crankshaft
bearings.

9.
Install the lower intake manifold
bolts.

9.1.
Tighten the bolts on the first pass in sequence
(1–8) to 3 N·m (27 lb in).

9.2.
Tighten the bolts on the second pass in
sequence (1–8) to 12 N·m (106 lb in).

9.3.
Tighten the bolts on the final pass in sequence
(1–8) to 15 N·m (11 lb ft).