The small Ford L6 has had problems in the past IIRC because there are both 4 main and 7 main engines (all 144 and 170 are 4, 200 made both ways, 250 7 only?) - but the dampers will be different based just on this point. Run the wrong one, expect a failure.
There are perhaps 9 orders of consequence in an L6, but only a few are strong enough to do anything: the 2nd, 2-1/2th (yes, what I said), and 3rd. The others either happen so high up (over 10,000 RPM) or are so weak that they have no effect.
