I have a head porter local to me that's very good. People come from all over the country to have him do work. He did my slant 6 closed chamber head. He says all of the import heads he's seen and done the castings are pretty high quality. He agrees the details could be better, but the castings themselves are pretty darn good. Jerry Killian is his name. Killian's Porting Service in Warner Robins, Georgia.