Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - levels of zinc in valvoline racine oil?
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Old 11-21-2007, 09:07 PM
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Valvoline racing oil is good for use in with flat tappet cams...

Castrol...? Dunno but never did find any of their oils with zinc in them...?

Royal Purple is full synthetic and would be fine for the flat tappet cams but for ring breakin you need a special hone finish...
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