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break in oil

  1. Break in oil?

    Engine
    Getting my 327 back for my 65 Malibu Convertible. Edelbrock 1406 Carb Edelbrock E-street heads Edelbrock air gap manifold 10-1/2 to 1 compression. Crane mild cam. About 375 HP Should I use break in oil? Some guys say it is a must. Some say it is a gimmick. They say the added zinc fills little...
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