[quote='Veeduber[_2_];695919']To All:

For example ALL engines have some degree of overlap
in their cam timing. If you have a text book that says otherwise, it
is in error.


No Not all engines have overlap, not early rotary radials with one pull/push rod operating the single rocker between the valves, opening one valve at the time, the valve clearence make it impossible to open both at the same time.

Jan