This Water Jacket Cover requires 20 bolts tightened in what pattern? Top to bottom, center to ends, staggered? In addition, the water jacket cover system includes a Relief Valve Cover that is a different thickness and not all bolts passing through it mount to the engine: some bolt to the water jacket cover itself. So the tightening pattern on this configuation has a lot of possibilities, but there is probably only one right answer. Does anyone have the answer to this?