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One thing I will say is that I would take the numbers that Porsche published during this era with a liberal dose of salt (on a Margarita glass....?) Porsche changed quite a few things during the Carrera 3.0/SC era and didn't change much of the published data. It's been hard for me to understand why they lost 20hp from the Carrera 3.0 to the first SC.
Likewise, they changed the cam timing all over the place, the port sizes, the exhaust and still quoted the same power output for the US cars during the SC production run. My own experiments with cam timing way back in the day yielded noticeable differences in acceleration, so I know the power changed. The weight numbers were always suspect too, especially in 1980 when lots of things that were formerly optional became standard.
When I drive a '78-79 car, it feels vastly different from a later SC.
JR
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