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If you get Mobil 1 15w50 it will also have the zinc you need for a flat tappet cam. The 15w50 is listed for classic performance cars, and I believe it has the highest amount of zinc (1200 ppm) of the Mobil products.
They had Mobil products on sale at Advance Auto Parts last month, and the sale may be still going on (it was something like 5 qts of synthetic oil and a Mobil filter for $32).
Bruce
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