911s up through the 2.7 used 6 bolts for the flywheel to crankshaft. With the introduction of the 3.0 liter engines and the larger bore center spacing Aluminum case, the flywheel was secured with 9 bolts. Not sure what you have since the short stroke early cranks do not fit in the later cases. 
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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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