The cost of torquing LS heads can vary depending on the type of vehicle and engine. Generally, you should expect to spend anywhere from $100-$150 for a simple job that requires just tightening the bolts, or up to $400 or more if extensive work needs to be done. If you're considering having someone else do this task for you, make sure they are experienced in working with LS heads specifically so that the job is done correctly. Additionally, always use high-quality tools when dealing with torque settings as incorrect tension can lead to major problems down the line. To ensure your safety and satisfaction it's recommended that you purchase quality torque wrenches manufactured by trusted brands such as Snap-On or Matco Tools.