I forgot to mention too on valve cover bolts start on a center bolt, put a little tension on it, then move to the next center bolt, then move out to the end bolt, then to the other end bolt, then back to the first, move in a rotating pattern a little at a time from the center out. It draws the gasket into place more evenly and will prevent leaks. I use the nearly the same process for the oil pan bolts. On the oil pan I start with the longer outer studs. Its easier to get a nut onto the longer studs. Gradually run the nuts in until the pan starts to approach the block and gasket. When the bolts are long enough to reach, start inserting them but only finger tight. You want to get every oil pan bolt in place prior to the pan gasket being sandwhiched between the pan and the block. Once every bolt is started adequately, start from the center and lightly start snugging them. Rotating pattern from the center out. After you have light tension on the bolts, lightly snug the end nuts, then go back to the center bolts. To properly tighten the oil pan takes a solid 5-6 passes. Install it the way I describe here with silicone in the places spelled out in the OEM assembly instructions and you will not have an oil leak from the pan gasket. Do it any other way and you will.