We modify cast iron cylinder heads, intake manifolds and exhaust manifolds for racing or performance applications. A large part of our work is for circle track racing applications around the United States. We supply bare or complete castings and can modify your parts, too. We are masters of 'undercover porting' and disguise work. We maximize air flow and increase intake volume to add more horsepower to your engine all while maintaining a stock appearance. We also offer acid porting, SST, and CNC porting services. Our modified racing products include cast iron cylinder heads, performance cast iron intake manifolds, and cast iron exhaust manifolds. We also produce equipment to flow test cylinder heads.