Jens,
If you think about it, there's no difference whether the dot is up or down as long as it is in line with the pushrods/camfollowers
But the crankshaft must be at top dead center
What would make you think that Clarence Lee knew any more about a Magnum four stroke than you or I? I wouldn't say that about the engines of his specialty like the Veco/K&B's. He is the King there.
Here is a quote from the Just Engines web site on how to set the cam timing on a ASP 91
"Easy to time, this is the first job on re-assembly, with the big end at top dead centre , the dot aligns with the pushrods. It just takes a little tooing and frowing and a slight rotation of either the crankshaft or the cam to get the correct alignment."
I'm sure the 80 is the same? And I have confirmed this setting on a Magnum 61 as well as a ASP 91.
http://www.justengines.unseen.org/ac...FS__Ring_.html