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The good ol' rule of 9, I completely forgot about that! I find the method dd explains is quicker and easier though, as you only have to turn the motor once.

In answer to your question Sumith, "on the rock" is the point when the exhaust valve is fully closed and the inlet valve is about to open. At TDC, you'll see either #1 or #4 cylinder finish it's exhaust stroke and begin it's intake stroke by seeing the corresponding tappets (1 & 2 for #1 cyl, 7 & 8 for #4) "rock" between closing and opening. When #4 is on the rock, #1 cylinder is about to start it's power stroke. At that point, the tappets for valves 1,2,3,5 will be loose (i.e. valves are closed) and can be adjusted. When #1 is on the rock, tappets 4,6,7,8 can be adjusted.
Remember to tighten them just enough so that the feeler gauge has a slight amount of drag or resistance when you pull it.