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If I have the #1 piston at TDC, how exactly do I check to make sure that the cam is correctly timed?

With the timing marks on TDC #1 compression, #6 should be on "rockover" which means that as you move the crank slightly back & forth(either side of TDC)on the harmonic dampener the #6 lifters will be at the same height & both moving.



Don't rely on this. Few modern cams are at "split overlap" which is what you are referring to, although this might be "OK" as a quick check, it's not difinitive