It depends on the rockers. The rocker ratio itself has nothing to do with whether they fit under the valve covers.
I have a set of Scorpion 1.6 RRs that will not fit under the stock cover and a set of FMS 1.7s that do.
You can kind of see how the Scorpions in this image are just a bit "beefier" when compared to FMS RRs.
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