Rob: Here is some more info Casting Number 3756519 58-62 low power 170, high power 315, Fo415D Flint Apr 15 day D-130 Have no idea. Web site Z28 Decoding chevy VIN, Trim Tag, And drivetrain codes. Hope this helps. Dan
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on 11/6/2017, 5:53 pm, in reply to "