Originally Posted by svtlx
i run hard with boost... it gets hot n there. i prefer viscosity than 5-6 more horse power..
that is semi true on stud mounted... but not 100% true on pedestal mount, which is wut he would be running. you tighten them down to zero lash, and it's pretty much gonna do wutever it does. not to mention, u see a few companies like scorpian that advertise how quite their rocker arms are... which means u dont have to buy a cheap set for them to clatter....
In the "old" days the viscosity argument would be true, but today with the better metals and lubricants we have available it is not really necessary. However, it is your choice and you should do whatever you are comfortable with.
Pedestal mount should be no different, you just shouldn't have to adjust them. (They can be adjusted somewhat by shimming or shaving the pedestals.)
If your lifters are "pumping up" properly and you have the correct length pushrods, your rocker arms should not clatter. Clattering is caused by something being loose or out of specification. Now mind you there will be some slight noises transmitted, but they should be minimal.
The last time I had to deal with the clatter was way back when solid lift cams were the big thing and that's been a day or maybe that's a few thousand days ago.