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Originally Posted by mrkbbd
no, the 4.8 is a 4.6 with a different stroke, and a 4.6 is an alpina designed motor
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Actually, the 4.8is IS a bigger version of the 4.4, both based on the N62 motor platform for 04+ with the valvetronic and double VANOS. The 4.8 is the N62B48 and the 4.4 is the N62B44.
4.6is is based on the M62 motor platform (M62B46) without valvetronic.