Quote:
Originally Posted by CaryTheLabelGuy
The N55 and S55 are not "almost identical". They are very different.
For starters, the N55 is an open-deck block, The S55 is a closed-deck block. The rest of the block is almost entirely re-designed/re-tooled over the N55. I don't really think it's even fair for BMW to use the S55 nomenclature for the S55, as its shares very little from it N55 sibling.
They're both 3.0L L6 engines with the same bore and stroke, that's about where the similarities end.
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Actually, according to BMW, they are 75% identical.