Haven't heard about a Holloway rod in a long time, We ran them in opens and never broke one. I've still got one I ran, somewhat of an I beam with big rod bolts compared to a Horstman. Holloway dropped out of the scene quite a while back, don't know what happened with them. They go back so far that it may need an older pin to crown height to make it work. What's the length of it? Jon