I’d bet most B’s are running around with cracked heads and don’t know it, and that’ll make a world of difference. There performance seems to vary quite a bit from car to car – and unless they’re professionally rebuilt, are mostly way off spec. My OD cars seemed to have different cams than the roadster, but I don’t think they’re really different – gears maybe. For speed – I think the older original motor with one less main spun faster; at least they broke quicker

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
Marcus Aurelius