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In mid-1975 Porsche began dipping its formed sheet steel body panels through an electrically charged 930 deg. bath of zinc. At this temperature, the zinc bonded galvanically to the steel. Every steel surface in the car body was "galvanized" at a manufacturing cost of nearly $100 per car (1975 911S base cost $11,875).
In model years 1977 through 1979, Porsche began having problems with the zinc galvanizing process and in some areas the zinc (supposed to be between 10 and 50 microns thick) ended up much thicker, and it didn't hold paint well.
- from the Porsche Buyers Guide
Stick to 1980 and newer 911's and you will be a happy man.
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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