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Boat-tailing is alright but even better is using a GT3 rear main seal. That causes the crankcase pressure to become lower than atmospheric and reduce pumping losses even more. Downside is installation requires splitting the case or so I've heard.
Think of it this way: 2 strokes use the downstroke of the piston to compress the charge for their next power stroke, so the case airflow can be quite significant. In a 4 stroke you compress the air, or at least move it, but don't use it for anything. Just wasted energy.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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