You can usually do a Google search for this type of information.
Here ya go.
Cylinder Head Bolt Torque Specification GM 3 1L and 3 4L Engines
So far all the sites that I've seen say the GM 3.4 is 44 ft lbs.
check it out on these 2 sites.
Torque Specs Database
Cylinder Head Bolt Torque Specification GM 3 1L and 3 4L Engines
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