On the 80 inch evolution engine, the heads torque in three steps and in a certain pattern. There are four studs with special "nuts" on them and the torque in a circular pattern in a certain numerical order.
They also torque in three steps. The first step is torqed to 84-108 inch pounds. The second step brings the torque up to 12-14 foot pounds. Then you mark each "nut" and tighten them 1/4 turn more.
I would imagine that the twin cam is about the same way but I would look a little on the internet to see what I could find. Go here for your information.
http://www.nightrider.com/biketech/hdheadtorquevalues.htm
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