I manufactured an aluminum race head for the Chevy 250/292 six cylinder several years ago. I took this head to one of the Slant 6 Awards Banquets to show them how a modern performance aluminum head could look and be made for their Slant's. You'd think in a room full of racers that there would have been more interest in this, since I was offering to create one for them for no start up costs and funding it out of my own pockets.....