Ok put it this way, why do you think they have an issue? Roller rockers are naturally more noisy and chattery than stock rockers. Have they changed their sound over time to think one may have loosened off?
You'd need to know current specs, they often use custom length pushrods so stock won't work. And depending why you had them in the first place, like a high lift cam, stock may not even work. Olds use 1.6 ratio rockers standard.
I'm fairly handy mechanically but even adjusting roller rockers I'd leave to someone who has been doing it for years just for peace of mind.
