Sorry, that is the engine brass tag number on a salvage Cockshutt 60 std that is sitting here, not the same engine exactly. Like you say from that brass tag number I already gave, it's a later made tractor than the Oliver with the missing engine part.
The two engines, in addition to being different with regards to the Oliver having this spacer that is necessary (and the Cockshutt 60 not having the spacer but the block unit is whole without a spacer) .... the two blocks are actually different in size. For example, the Oliver engine (earlier one) is taller from the block's pan surface to the top surface where the head bolts down. They are also differnt in overall length from the clutch housing flange to the front of the engine block. Both are definitely model 60 engines, one from an Oliver and one from a Cockshutt.
I have no brass s/n tag on the Oliver engine block (that needs the spacer). But here are some casting numbers from both ....
OLIVER (needs spacer) - 180220E IL100B
COCKSHUTT (no spacer) - 160120E Alloy 211 CWC ENG. S
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