One at a time. If you take them all off at once the gasket will release and not be useable.
Usually you go in 3 steps. I.e 20-40-60 but when doing them one by one just go straight to 60.
And then once you have done them all just go over all of them in the sequence above at 60 again to ensure they are all down properly.
Once running, Let it get fully to operating temp and then fully cool off.
Do this twice and then take the rocker covers off, crack the nuts 1/8th ish of a turn and pull them back down to 60ft/lb (do this one at a time just like replacing the studs.)
This ensures that after some use after all the threads have seated they are still torqued to spec. You can sometimes get 1/4 to 1/2 of a extra turn out of the nuts when doing this.
Retorquing the studs after one or two heat cycles of the engine is a must for non-stretch type fasteners, mostly to allow for gaskets settling down, so less critical in your case as its a pre-crushed gasket, but its definatly still worth doing to giveyour gaskets the best chance possible of surviving. Especially as you said it has been pushing water already.
Usually you go in 3 steps. I.e 20-40-60 but when doing them one by one just go straight to 60.
And then once you have done them all just go over all of them in the sequence above at 60 again to ensure they are all down properly.
Once running, Let it get fully to operating temp and then fully cool off.
Do this twice and then take the rocker covers off, crack the nuts 1/8th ish of a turn and pull them back down to 60ft/lb (do this one at a time just like replacing the studs.)
This ensures that after some use after all the threads have seated they are still torqued to spec. You can sometimes get 1/4 to 1/2 of a extra turn out of the nuts when doing this.
Retorquing the studs after one or two heat cycles of the engine is a must for non-stretch type fasteners, mostly to allow for gaskets settling down, so less critical in your case as its a pre-crushed gasket, but its definatly still worth doing to giveyour gaskets the best chance possible of surviving. Especially as you said it has been pushing water already.