As far as I know, both are equaly important. I think what Graham is implying is that many people check the valve lift which is relatively easy to do but duration is not checked and this is what causes problems and loss of torque through the rev range, when duration is not the same for all 8 valves. Although I must add that I don't understand how duration can be out if lifts are the same. I guess so long as all the like valves are the same.
When Graham and I did my head he measured lift and duration on all 8 valves at a standard setting of 18 thou tappet clearance, the lift of the inlets were all within a thou of eachother at 397 thou. The duration measurement (from memory) was 270 duration at 18 thou for all inlets, we then closed this to 16 though and it was 272 duration. Close it further to 14 thou and the duration was 274. Since the RE13 is 276 duration, the closest possible to this would be ideal (that's at least I think what graham said!
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Either way, after reading Graham's article again, i realised that the toyota rockers are much more similar to eachother than S ones are as I am going to set all of my tappets the same clearance whilste to get his S ones to be the same he needed to set the tappet clearances to radically different setting depending on lift.
