In this month's issue of Hot Rod magazine it features some good info on Smokey Yunick’s legendary hot-vapor engine.
http://www.hotrod.com/techarticles/engine/hrdp_1009_what_ever_happened_to_smokeys_hot_vapor_engine/index.html (http://www.hotrod.com/techarticles/engine/hrdp_1009_what_ever_happened_to_smokeys_hot_vapor_engine/index.html)