On a 2002 buick century 3100 Do you have to take the push rods out change lower intake manifold gaskets and if so what is torque spec for rocker arms?

Yes, you will need to remove the pushrods to replace the lower intake manifold gaskets on a 2002 Buick Century 3.1L engine. Here is the procedure for removing the pushrods:

1. Disconnect the negative battery cable.

2. Remove the engine coolant reservoir.

3. Remove the upper intake manifold.

4. Remove the fuel injector wiring connectors and brackets.

5. Remove the fuel injectors.

6. Remove the pushrod covers.

7. Remove the pushrods.

To reinstall the pushrods, simply insert them into the lifter bores and install the pushrod covers. The torque specification for the rocker arms is 22 ft-lbs (30 Nm).