Talking to a man with a set of these heads that have been setting on the shelf for many years. Would like a realistic value on the heads. What I was told is the engine was rebuilt about 20 years ago then the car was sold to the man now owning it. He took these heads off the engine at that time, and installed aluminum heads. I have not seen the heads but would appreciate an opinion on value. I put this here thinking it might be better place to put this question. I also would like to know what everyones opinion is on these heads. Part number C3AE-J , while looking this number up, I noticed it was next to the K high riser heads. The book shows these heads have the same port isze but different valve size. I can only assume either the location of the ports or head thickness makes these heads low riser and high riser. It's been said the intake manifold is the difference.