In addition to Nordin's suggestions, always cross torque especially when it involves gasket that requires sealing. At the minimum, when torquing, do a two step process or even three depending on the size and length of the bolt being torque. For example, if torque requirement is 180 in-lb, you should at least do 90 first with all the bolts while following a pattern if required or cross torquing if no pattern is required. And after doing all bolts for 90 in-lb, then start all over again this time doing the full required torque of 180 in-lb and finally start all over again and double check all bolts again and none should turn more than a quarter when torqued to 180 in-lb. Otherwise, you will have to re-check all the bolts again until none turns more than a quarter. If you decide to use a three step process, then you will initially torque to 60 in-lb, followed by 120 and finally 180 in lb.