Two sizes of roller rockers are sold by "The Doctor."  With my cam, one 
provides 0.347" lift and the other provides 0.392"   The former cost half of 
the latter because they are slide-ons for the stock rocker assembly.  Vizard 
shows relatively little improvement in performance for valve lifts above 0.350" 
and my machinist points out there is little sense in higher lift if the head 
can't breath enough.
What are your thoughts on choice of rockers for a "warm" 1310 street engine?
Michael Rowe
Aspiring engine builder
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