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Originally Posted by mrkbbd
he's talking about the block itself, the m/n just means valvetronic or not, I remember when the 4.8 came out C&D did an article and said that the way they added the extra power was to change the stroke on the 4.6 and add valvetronic
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Even with that argument, the 4.8 is still a bored 4.4, both with double VANOS and valvetronic since the 4.6 does NOT have VANOS or valvetronic.
If he's talking about the block itself, then all of them share the same block.
http://en.wikipedia.org/wiki/BMW_M62
http://en.wikipedia.org/wiki/BMW_N62