I use a local guy who used to run one of the most renowned machine shops in the country. He has started off on his own now and wishes to stay relatively unknown for the time being due to not wanting to be swamped before he is ready for a flood of work. I trust him implicitly as he has more knowledge about race engines and heads than anyone I've ever met... not to mention, he will travel to any race with you and crew chief your car to do everything possible to make sure you make it to the winner's circle. He's not cheap, obviously, but for what he provides, it's worth every penny and then some! Even on a simple cam swap/ ring replacement on my street car, he drove 40 minutes to my house and degreed the cam, set the rockers, and basically just double checked everything on my engine, no charge. I had to force him to accept gas money!! Now THAT is customer service!!