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Acutally, the '75 model was still the B30F. The 'E' designation after the '164' indicates that it is a fuel injected car, as opposed to carbureted. The 'E' in the motor designation (B30E) indicates the high-compression version used in European an other markets. The B30E in Sweden put out 175HP, thanks to the higher compression and a hotter cam, whereas the smog-strangled, low-compression B30F put out 145HP in '72-'73, 138HP in '74, and something like 125HP in '75.
I believe they lowered compression using the internals, rather than changing the head, but I'm not sure. A 175HP 164 backed by the M410 would be a sweet car. But if I ever had a million bucks dumped on my lap, I think I'd keep my low-compression B30F and get a turbo setup from GIK Turbotecnik.
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