It was at Drag Week a couple years ago. Small block Chevy with an aluminum head on one side and a cast iron on the other. I don't remember for sure but I think he was running a ton of nitrous. Either that or turbo/Procharger.
That's right, I knew I had seen it before. Was in Hot Rod for the coverage. I remember that about the cylinder heads, too. Shoulda put the iron one on the driver's side