You might gain some top end but the roller rockers have it all over the stockers. They are also much cheaper than any 1.6 roller.
I had to go through three sets of Cranes before I found a good set of pedistals and even then I had to buy the replacement set for another $15. The pedistals I got with all my rockers were machined crooked so the tip didn't set square on the valve tip.
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