For question #6 on overlap. That takes place when any one piston is at the top of it's stroke after exhaust and the intake valve just cracks open while the exhaust valve is just about seated. This is hardly noticeable but can be seen if everything is adjusted correctly. The engine will never stop in this position so it has to be seen while rotating the engine over slowly.
Also when any one cylinder is in overlap the valves can be adjusted on it's running mate, since it will be at the top of it's compression stroke.
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