Did you have any other problems with the IndyBrock heads. I just bought the same heads (full CNC port with the bigger valves) and the quality of everything sucked. Did a vacuum check and they failed. Valve to valve seat was off as much as .006. Valve guide clearances were as high as .0045. They did not use hardened shims under the springs, they were soft. The exhaust valves were .043 shorter then the intake valves. The worst part was the flow check. They claimed they flow 304 cfm at .600 lift on the intake and mine only flowed 283cfm.