Jonathan,
Spec # is 281033h.This was in a 70 but it has 4 holes threaded in the block on the pto end ,so I am thinking it is not a cub block,but it was fine in the 70.PTO and the crank dia were the same.
This was already bored out .030 I thought the early blocks were able to be bored to the newer 2 15/16 bore which is STD.Seems like a lot of meat left to bore it larger
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