Indy has a new 600-13x head on the shelf now. The head was developed by Goodwin competition and Best machine. the new head fits a 4.840 block, flows 520 cfm @ 1.00". Indy makes the head and Goodwin does the porting. We run the prototype in in a 88 mustang, they are not as good as the new head will be , as we are still revising the exhaust port. That will be done by the end of July. When they are complete we will build a 632" motor to run in mx235. With the 565 motor we are presently racing we go 5.00 at 2950 on 26 in tires. It makes 1222 on a very tight dyno. If anyone is interested they should talk to Chuck at Best Machine 1 248 987 6038.