< If it's the same Alumitech out of Santa Rosa, Ca. I have had very bad luck with them. One head came so full of bead blast grit that I had to run a tap down every thread and trashed several spark plugs before I wised up, a second, the guy quit on after my mentioning I hoped for 100k out of it. But he then didn't even have the courtesy to let me know, he just let it sit on his shop floor until I called.