273 cam & crank timing marks, confussed

Crank sprocket is EXACTLY half the size of the cam sprocket in ALL 4 cycle engines. Every other revolution of the crank the cam "dot" will be at 6 o'clock position with the crank "dot" at 12 o'clock. The pistons don't know if they are at TDC on the compression or exhaust stroke. The distributor position is relative to the cam shaft only.

Ever wonder why you can set your timing off #6 cylinder the same as #1?