well when i did my engine build my machinest told me to go with prw stainless roller rockers, i did and after a cpl yrs and about 3000 mi i took the car on a trip and noticed a loud tapping noice, i pulled ov the valve cover and one of my rockers had metal shavings coming out of the bearings, so now im going to get new ones and i need advice, i have a olds 350 and i need 1.6 ratio on a 3/8 stud, any advice would be helpful, ohh and i found out they were made in china and design was stolen from crower lol