What's their motto again? If the US engineers will design it, we can build a knock-off?Don't worry. You're still in luck.
I hear North Korea and Iran are going to start making cheap knock-off head castings too.
They never "Made" any springs.:no: They simply reboxed/private Labled springs from another well-known supplier. VERY common practice, as Comp, Lunati, Cam Motion, etc. don't "Manufacture" valve springs either. :no:They made decent springs, but that was about it. A factory head LS6 head would often outflow there ported versions...
LS6 heads still rock to this day for a factory casting (243) and can be had for a decent dollar.