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It may be in the back of Fere's Porsche 911 Story, or in Bruce Anderson's Porsche 911 Performance Handbook. The main thing was that the early engines were sand cast Aluminum, with the 906 being Magnesium. 911R was Aluminum I believe. Then they switched to Magnesium for everything until the 3.0 RSR engine came along, after which the 911SC and onwards used Aluminum. 935 and 936 used Aluminum.
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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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