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Ed,
That's only partly right. The bypass mod returns oil to the input of the pump not the tank. It sort of has the pump working the oil in a circle back to itself instead of dumping it into the bottom of the engine. I don't know if the holes in the old style piston have something to do with how the old bypass works or not. I do know that with the bypass mod you have to use the new pistons and springs so it's likely that the reverse is true as well.
-Andy
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72 Carrera RS replica, Spec 911 racer
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