Problems ALREADY! (engine knocking at certain RPM - HR16DE - solved)

[IMPUL]

On the front, viewable from above, to the right of the oil filter.
Production date is on the information / complience plate on the "B" pillar between front and rear, on drivers side at the bottom.

Usually all bearings are the same. Some are location specific.

What makes cyl #2 different. Coolant.
Right beside #2 is the cold coolant enterance.
Which on a side note. Do we even have a water pump? Cause if we do thats an odd one.

And the block heater... Heats the hot side of the coolant. Where the thermostat is.

So wrappage could be the culperit. Now these engines are under torsion during milling, then the torquing of the head straightens the block. Wonder if that affects it?

Anyways, oil and coolant both seem to perfom actions at or about cyl#2
Maybe all those galleries and oficies affect the expansion and contraction?