Right on EV2Bird. The application is critical. United Engine & Machine who manufactures KB hypereutectic pistons and Icon forged pistons has an application chart in relation to silicon content. I have it but don't know how to load it on here. It may be on their web site by now. UEM was the innovators of the KB hypereutectic pistons. Their primary purpose is for performance street use. But can be used in race applications of limited rpm motors. Just remember, on any hypereutectic piston the ring end gaps are very critical. Follow the directions that come with the pistons.