I have a set of GT -40 Aluminum clyinder heads. They are a 64cc head. They have been cut .010" , they have been ported by Heads-up performance at Holcomb motorsports. They have 1.94/1.54 valves, and they use pedestal mount rockers. They still have alot of room left for more port work if needed. They pushed my 93 coupe w/ a very mild cammed 393 stroker to [email protected] These are really good heads but I am looking at going Supercharged so I needed a bigger CC head than these 64cc to knock some compression out of it. That is the only reason for the sale of these heads. They have about 200 miles on them and work perfectly. Included with the heads are a set of 1.7 Crane "Cobra" roller rockers. I am asking $850 plus shipping. Feel free to ask me any questions. They have also had their head bolt holes drilled to 1/2".