If a run of 340-3 has revisions made and the new castings are 340-4....then there must be something in the 340-3 that needs correcting or adjusting....otherwise there would be no changes made?
To go from a -3 tooling revision number to a -4 something would have been changed on that core/mold. It doesn't have to be a factory revision though, it could have been just a repair to that particular mold/core. Somebody dropped a core and repaired it, it goes from -1 to -2. At least according to 440 source, the revision number on all the blocks being poured at the same time would not all be the same. If all the blocks on the floor have different revision numbers and a new revision comes down, you couldn't just say look for a "-3" because some of them would have already been a "-4" and another one could have been a "-2" and yet another might have been a "-9". Which means you couldn't assume that all the "-3" blocks had the same revision, you'd have to look for the revision itself and not just the number. Which is why 440 Source, Doug Dutra and others say they don't pay attention to the tooling revision number and inspect the individual blocks.
