What are the torque specifications for gm 3.4 cylinder head bolts?

There isn't a single torque specification for all GM 3.4L cylinder head bolts. The torque specification depends on the *specific year and model* of the vehicle, as well as whether the cylinder heads are aluminum or iron (though the 3.4L generally used aluminum). Even the type of head gasket can influence the torque specs.

You absolutely MUST consult a factory service manual for your specific vehicle. This manual will provide the correct torque sequence and specifications. Using the wrong torque can lead to head gasket failure, warped heads, or even catastrophic engine damage.

Trying to find the torque spec without knowing the exact year, make, and model of your vehicle is unsafe and unreliable. The information available online may be incorrect and lead to serious problems. A factory service manual is the only trustworthy source.