break in oil

  1. Break in oil?

    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...