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The most accurate way that I have foundis like this..
Turn the motor so that a valve...start at one side at the front and go back.......is fully open.ie pushed fully down. Make a mark on the front pulleyand turn the motor exactlyonce around so the mark is back where you made it. The cam lobe will now be exactly 180 degrees or on the bottom of the lobe. This is the point at which you should set the rockers. Get the zero lash point and then turn another 1/2 to 3/4 turns.
If you have a solid cam this is the best method as well. This is the point at which to set the valve lash and you will have the cam at exactly the right place.
Good Luck,
John
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