Ihave engine books that go from 1960-1981 and from what you have given is tha t it was built at flint engine December 19,1979 and was used in a 1980 model pickup. The old engine part number was 14021821 it doesn't denote whether it was a 2 or 4 bolt main.
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Sunday, June 8th, 2014 AT 11:15 AM