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When I post the final specs for lift and duration I will explain more but for now I will give you some general rules of thumb applied in camshaft design.
Increases in lift up to 30% of valve diameter typically improve low rpm performance.
Increases in duration typically improve high rpm performance.
Engineering constraints need to be tackled in order.
The first limitation is clearing the exhaust gasses
The next is filling the cyllinder with the intake charge
The main things that can be done to improve exhaust are opening the exhaust valve earlier and moving the lobe center closer to optimal
The main things that can be done to improve intake are increase duration and move the lobe center closer to optimal
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