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By Cliff - 6 Years Ago Does anyone know how to read casting dates on factory manifolds? By Ted - 6 Years Ago  Assuming the manifold is a ECG-D unit, the casting date is December 18, 1956.  The part number will be on the bottom.   Here’s a list of ECG-D manifold dates that were collected awhile back. http://forums.y-blocksforever.com/FindPost138535.aspx By Cliff - 6 Years Ago Thanks Ted