I have looked and not seen any answers about this topic so was hoping someone may have some insight as this seems like one of the more active forums regarding N62's

The N62TU (4.8) had revised crankpin diameters but the main journals are the same diameter and the main bearings are shared between the 4.4 and 4.8. The main difference between the engines is the stroke - 82.7 vs 88.3mm. It seems to me as though you can use the 4.8 crankshaft and connecting rods with 4.4 pistons - a 4.8 crank in a 4.4 would yield an engine with a displacement of approximately 4.7L (4695.88)

The main advantage of this build would be to use an Alpina H1 block, which is stronger, paired with the 4.8L crank and rods which BMW says are stronger, to make a 4.7L variant of the H1 which in theory could accept more boost than the stock configuration. However the main difficult I see with this would be tuning, as it does not seem like there is anyone out there who really "tunes" these engines. I suspect the complication from Valvetronic timing (and the DIVA intake) plays a big role in that

Has anyone pursued such a build previously? Or does anyone know a tuner who would be willing to dabble in such a build?