I replaced the crankshaft pulley awhile ago. Now I want to adjust the valve clearances. On the crankshaft pulley, there is two notches, I want to know if these marks represent the top dead center on the left side of center and maybe a few degrees before top on the right mark? The cylinders have to be at top to adjust valves. One of these marks has to be on the block split line to be TDC.