In Reply to: Oil Filter Housing posted by Tim Daley (MI) on January 28, 2009 at 08:20:01:
I would bet that it is a manufacturing advance. When you get a chance check one of the smooth bottoms, likely it is welded on if not it was spin shaped. Either process would be more expensive than stamping. The scalloped housing could be the result of stamping and the scallops are where the extra metal went. These are Pure-O-Lators for the most part and if the process changed it could meet Ford criteria with no design change. I often wonder why in later N's there are housings with drain plugs, some without and again some with.
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