im on here cuz im a car guy with an original set of what ive been told are z28 heads i dont need and want to sell. I've ran the numbers and come up with some odd info on them. I wont sell them to an average joe because they are too hard to find still in good shape and in working order. bolt and go. i tested them on a smallblock 355 and damn did they work great. perfect for a restore. any questions or offers email me nyesnyder@yahoo.com. i dont check my emails alot so be patient, i will get back to you