89 3.1 GM aluminum cylinder heads. running/working when pulled. not warped and no leaking head gasket issues with engine. engine had 111k on it. have been sitting for years. no other 3.1 parts available. not sure what other years they fit, I had a 1990 oldsmobile and a 89 baretta, 90 cavalier, and 91 lumina, engine appeared to be the same. these heads were from the 89 olds cutlass supreme international series. phone calls or emails only, there is no text on my home phone. pick up in wi 53120