I was tearing my hair out try to figure out my rocker geometry. Then read in a namdra article all cheaper amc and ford roller rockers were really chev 1.6 ratio units. In some catalogues they are even same part number. The stud to pushrod tip, and stud to valve tip distances were both wrong. Seemed like comp cam hi tech, crower stainless and a few others were okay. Then with lifts of around .550" and up chev 1.6 units worked well again? That was a while back, maybe crane is better now? __________________________________ Yahoo! Mail Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail