Just like the Merlin with it's different versions, the DB601-605 had their own versions as well. That's why there's different speeds etc. for certain 109s, that were powered by either a 601 or 605. I mean a early 109 powered by a 601, and a later 109 powered with the 601 as well, will more than likely have different speeds because they did this and that to increase the power of the 601 or 605.
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