I'm rather curious to know that myself, but I'm pretty sure the stories of ratios not measuring up were more directed at factory stamped rockers. Some have been measured at over 1.5, while most were under. I recall reading in HR and PHR many moons ago that the typical observed ratio was closer to 1.45:1...but that goes for MOST domestic engines. Some SBC rockers they (HR) had measured in the past calculated closer to 1.42 or 1.40!