tho TDC is timed on piston 1 its only for simplicities sake yeh ?
from what i understand the term coversthje timing across all pistons - as they all should have indentical timing. Its just that they events occur one after the other in sequence. ie 10deg advance is 10deg across all pistons
i do disagree that they dont use valve overlap anymore. Refer to :
http://members.aol.com/solomiata/cams.html
You can clearly see that overlap exists in these OEM cams. It even provides the overlap degrees in the chart.
lol not that it really matters !!
but i just wanted to check if my memory served me right