To achieve the proper bolt stretch the torque values need to be consistent. This means the bolt threads must be lubricated. Many engine builders use ARP’s Ultra-Torque lubricant and Dorton says it works well, but he says he’s used extreme pressure lube for years with no problems so he sticks with that. What you use as a lubricant isn’t as important as long as your bolt manufacturer provides a torque value to use with that specific lube. Because different lubricants have different lubricating properties, the torque value you use will be different depending on the lubricant. Don’t forget to lubricate both sides of the washer as well as the underside of the nut or bolt flange as well.