Timing 318 basics...

You really don't need to "know" that, all you need as I said is to watch them move. When the timing marks come "up," if you watch no6 and no1 rockers,

1--On the compression stroke for no1, as the timing marks come "up" to TDC and even past, BOTH no6 valves will be moving. For a few degrees before/ after TDC, neither no1 rockers will move.

2--If the crank is rotated one turn, the situation is reversed--this time no6 is ready to fire, and it's valves will be closed some degrees before/ after TDC, and both no 1 valve will be continuously moving.

The "few degrees" of non movement will depend on how hot the cam is in the engine.

Just think about what the engine is "doing." If you come up to TDC and both no 1 valves are moving, this is the piston coming up to the end of the exhaust stroke, so the exhaust is starting to close, and the intake is starting to open. As you go past the TDC mark, the intake will open wider, the exhaust will finish closing, and you are on the "intake" stroke. As the piston "heads down" to bottom, the intake will close, the piston comes around the bottom, and finally, back up to TDC ready to fire, both valves closed.