in my 4 banger, theres a lil noise yuo can hear when ur pushing the gas till about 1500-2000 rpm, in my manual is says replace rocker if its ttorqued down all the way, so everything is torqued down all the way so im gonna change em but can i just take em off and change em or do i need to change other things in order to change tonew rockers?
You should take a look at the end of the valve stems and pushrods. There is a wear pattern created between the rocker, rod and stem. If there is alot of wear, you should change whatever needs to be changed (rods, valves).
