Just received my ARP head bolts. I always wondered what the big deal is between stock bolts and ARP bolts. After seeing them in person I now know why. The quality is unsurpassed.
Plus the technology that ARP incorporates into their products is amazing. They take into account the amount of torque lost to the amount of friction between the bolt and the block.
For 12mm (shank not bolt head) 190,000psi tensile strength studs (they don't list 12mm bolts they only go up to 10mm bolts) they say use 86 ft/lbs of torque. It also says that is a general specification its not application specific. So what torque spec. have you used Bill UK? Or anyone that has done this themselves?