If you move the crankshaft to 45 deg OT you will be able to rotate the camshaft all the way around. The Bentley manual and Beisan procedure are not totally clear on the position of the cam shafts although they both elude to the "E" AND "A" markings facing up when installing the cam locks . The G.A.S instructions make it very clear that the markings should be facing up when installing the cam locks and this is the way I did it the first time. I am almost done rebuilding my heads the first week of September and will be putting it back together at that time. I will let you know how it turned out when it is running.