Headgasket torque. The SAAB site = Place the cylinder head into position and using new bolts tighten in the order shown. Step 1: 25Nm (18.5 lbf ft). Step 2: Tighten a further 90 degrees. Step 3: Tighten a further 90 degrees. Step 4: Tighten a furhter 90 degrees. So far so good, but Chilton want's me to put step 5 = another 15 degrees, and a step 6 = another 15 degrees. Who is right? Much gratefull for advice, since I need to get this car out the shop.