The Dow Corning 730 Sealant has always been BA's favorite, albeit expensive, choice for sealing the 911 engine.
The following chart may be of some help to explain why ...
http://www.dowcorning.thomasregister.com/olc/dowcorning/aero.htm
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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