must be an engine builders industry secret thingy that bmw rods are
the creme of the crop in engine hybrids.
So you spooling out for the H beams? what pistons you going to run?
Ive seen some bmw aftermarket forged pistons weighing round 400 grams
somewhere, I think they where 27.5mm in comp height.

Nick forgot to answer the 8v head qs in your PM
The 8v heads are all the same except early ones are not twin spark,
camshaft grinds are different and early ones are solid lifters.
The 8v looks like an early dodge hemi and late semi hemi twin plug hybrid.

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