in the new manual it states that no drain plug was used. on my dads original pan i has a drain plug. it does not look like it was added after the fact. it uses a 7/8 hex head plug (like used on oil pans). here are some pictures
here is the stamp on the side of the pan. the car was built the second week of June 67

out side the pan

inside
here is the stamp on the side of the pan. the car was built the second week of June 67

out side the pan

inside

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