Quote Originally Posted by 34_40 View Post
IF, you want #1 cylinder to be the "lead" cylinder that you will set ignition timing by. Then you need to rotate the crank 1 more time.
With #1 cylinder at TDC, and both valves closed, the cam gear dot needs to be at 6 o'clock and the crank gear dot at 12 o'clock.
I would advise you to do this so that ALL OF US here are on the same page. What that picture shows is that cylinder 6 is the "lead" for timing the ignition.

I am using the term "lead" for lack of a better word. This is probably why your timing is shown so far off. Hope that helps...
Come on fellows, this is not rocket surgery. When you assemble the motor and put the dots together, cam at 6 and crank at 12, the motor is set up at that point to fire #6. You have to rotate the crank one full turn, so that the cam is at 12 and the crank is at 12 in order to fire #1. I have no idea why the engineers at GM marked the sprockets that way, but they did and we have to know to rotate the crank one full turn after we put the motor together so that we can fire #1. One more time, 12 x 12 to fire #1.