I cut and pasted this from another thread that i contributed to....could be use ful just to make sure you get the pulley in the right spot,and ofcourse to fix those people up that think the pulley cant move or be out of position
First of all to be anal you would want to make sure the crank pulley is accurate(of which it will not be)To do this put a degree wheel on the front and line the "0" up to the original TDC mark,then get an old sparkplug with the guts taken out and a bolt welded in it(make sure it hangs out an inch or so)Put the piston down at BDC and screw the modded sparkplug in.Turn your engine clockwise untill the piston hits the plug.Write down the figure on the degree wheel,then go anticlockwise and write that figure down.Then after work out the half way point from the two figures you got and move the wheel to that point......Now you have your True TDC stamp the front pully with a chisel(however this possition may change after time,so i like to scribe the mark down onto the centre of the pulley and check it out now and then)My pulley was out about 3 degrees or so....I have never seen one thats right!