B3,
Post 167. That is exactly I said in post #$163: reduce duration if you want a smoother idle.
To others: all else being equal, tighter LSA creates less idle vacuum & rougher idle.
As cu in increase, the engine sees the cam as being smaller.
the hot Rod test I posted used the same duration on each LSA cam.
Of course decreasing duration will smooth out any cam, but decreasing a given cam’s LSA won’t. Narrower will be choppier
You didn’t seem to agree with that earlier.