Yea the factory stamped steel rockers say they are 1.5 but I have heard they are more like 1.4. That said I used them for years on the old 383 that was in my sons Dart. It had the MP .484 cam and it ran as fast as 12.31 with the stock rockers on it. They dont work to bad but I did use rocker shaft shims to set the lifter preload to .020. Ron