When you're torqueing a cylinder head, manifold, or any other part held with more than 2 bolts, ALWAYS start the torque cycle from the center and work outward in a circular pattern. That is, start with the center bolts, then the right and left bolts closest to the center bolts, and so on. And as pinebluffdude said, tighten the bolts in 3 steps. First step is 1/3 of the final number of foot-pounds of torque that's needed, then 2/3, and then the last step is to torque to the final amount of torque needed. Two other things you want to do are to clean the threads with a tap or thread chaser, and lube the bolt threads before you torque the bolt. When you torque dry threads, friction will give you a false reading due to friction between the bolt and the threads of the hole or the nut that the bolt is being screwed into, and the bolt won't be as tight as you think it is. I usually use either engine oil or Super Lube for a bolt lube. And don't try to economize by not buying manuals. You can never have too many manuals, and the info they have is worth more than the weight of the manual in gold a lot of times.
