Iron block, VANOS, etc all add up. But look at the power/liter of the S54 compared to the pushrod V8--interesting comparison. The S54 is a high revving motor as well--and your paying a bit of penalty (if you can call it that) vs. the low revving engine, with simple design, in the 'Vette.
That said, I really think all BMW's need to go on a diet. My E92 weighs about 500 lbs more than the Z4M. Talk about weight envy! And that with the S65 engine which is lighter than the S54. The next gen Z4 weighs more than my E92!
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