This is an aluminum manifold for a V6 engine. Some time ago I researched the part numbers and was told it fits V6 Buick engines from 1975 to 1979. It is in good shape. There is a very small piece broken off where that plug screws in on the front of the manifold. It does not affect the operation at all. The part numbers are on the bottom of the manifold so you can figure out if it fits your engine. Part # to Google 701r-22 300-22