Re: BB Camaro/Chevelle Oil Pans
#3958657 was used from 66-70.Sometime before October,1970 it was superseded by oil pan #3985999,used well into the late 1970's.Oil Pans varied widely according to the vehicle,so these are specific to the Camaro-Nova-Chevelle/Elco/Monte C.
Mark IV pans from 1968 & earlier had a 3/8" narrow "rounded" rear main lip.
Mark IV pans from 1969 & later had a 5/8" wide "squared" rear main lip.
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