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Phillippe,
The oil bypass mod is done to the crankcase so that a later oil pump can be used. The pump is from 1976 on and has a larger pressure section and a smaller scavenge section. Because of the smaller scavenge section the scavenge pump cannot evacuate as much oil from the case and the bypass for the pressure side must exit into the intake of the pressure pump instead of just venting into the case. The mod is done by drilling a hole to connect the bypass channel to the intake channel of the pressure pump and by plugging the exit of the bypass channel where it vents to the case.
-Andy
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72 Carrera RS replica, Spec 911 racer
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