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they do not need to be replaced ..the valve lash should be checked only on full roller rockers 20k miles is ok...then they should be checked(valve lash only)..stock and roller tip rockers will never have to be replaced unless there is a failure with the fulcrum
IMO..full roller rockers are really only for high winding serious street /strip/autocross applications
i will be using mantaparts roller tip rockers...that guy did what i like to call overkill...or like 3.4 said...the wow factor..unless he has a custom crank and cam, and etc. full roller valetrain in a street car, is a waaste of money unless it comes that way from the factory.
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OCA Alero Chapter Member!!!!
ALERO-LESS 
1971 Olds Cutlass budget pro-touring project
2005 Nissan Altima SE-R 6spd MODDED! (wifes pocket rocket)
1998 Ford Explorer AWD 5.0...modded, and fun DD
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