Should I retorque head bolts? Yep, that seems to be a big question ... this example provided by Summit Racing, you can see the torque sequence for a typical LS head. The pattern for most heads ...

Something a lot of weekend wrench-spinners overlook is “torquing” their nuts and bolts. Torque values for fasteners ... such as connecting rod bolts and head studs are loaded in tension.

A certain amount of leeway is built into almost every factory part. Take Project Rust Bucket's turbocharger for example, which is now producing 37 pounds of boost instead of less than 20.

Following GM’s head bolt torque sequence (center out) and ARP’s torque specs, Chad makes three different pulls on each stud. The first calls for 50 ft-lb, 100 ft-lb for the second, and 150 ft ...