well cardo, since you're in my thread now, i'll give you an education about bearings in this kind of environment.
i work with different types of bearings under different forces and lubrication systems in different machines, quite a bit, and i can tell you, these particular roller bearings are subjected to certain types of forces, and they are in a certain type of lubrication environment, therefore they must be designed with a certain level of compliance (hence..noise) to keep them alive.
you COULD use really tight roller bearings that weren't noisy in a rocker, they do exist. but they would fail early, because they have no forced supply of lubrication, so they would tend to force what little oil they have out. also they would have increased friction, generate excess heat, and your valvetrain geometry would have to be so perfect, since there'd be no play...
ever wondered why if you listen to a 2-stroke engine's crankcase it sounds like it's falling apart inside? it's because they have to run roller bearings on the wrist pin and crank, because a 2-stroke engine has no forced oiling system or oil sump available, it just gets a mist of oil.
a roller rocker is VERY similar to a 2-stroke rotating assembly in terms of bearing configuration, as they are a bearing surface that is "splash oiled".
to summarize:
low friction roller bearings rattle. higher friction roller bearings tend not to rattle, but require forced lubrication, or are for use in lower stress systems with shorter operational duty cycles..
every roller rocker rocker setup i've heard is way noisier than stamped ball thingie rockers. higher performance rockers also raise the level of noise consideribly due to their lower weight. heavy things in a valvetrain are quieter. if you added some weight to your roller rockers, it would quiet them down, as it would dampen the resonance of the bearings substantially.. of course that would cost performance, and at that point, you might as well run regular 'ol rockers.
im running those blue junk PRW rollers now. they work fine, im happy with them. due to all the reasons listed above, they make noise despite all clearances being verified...
i dont expect them to last forever, but they're pretty good quality for the price i gotta say.. i'll probably run them for 20-30k until i save up for something really nice. maybe shaft mounted..
those other rockers in the pic aren't comp. they're knockoffs. there's nothing wrong with pivot ball rollers, except they dont respond well to high spring pressures, all the extra pressure on the fulcrum just makes the friction even worse, and you're going to be a few ponies behind having full roller rockers. but hell even roller tip rockers are noisy..
