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Just pulled out my No. 4 Bosch spark plug, just for kicks, and it looked exactly like your No. 4 and the rest of them. My original California 79 SC has only 50k miles, but I don't remember when the present spark plugs were installed. And, same as your car, the engine runs fine.
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79 SC Targa
72 T Targa Sold
68 T Coupe Sold
65 912 Coupe Sold
62 356B Coupe Sold
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