422 dyno fail

B3,
And how many cam combinations have HRM tested? Anywhere near the 19,000+ that DV has?
Try getting your facts right before say somebody else's comments are untrue.
DV says this on p. 97 of his BB Chev book:
'If maximising power & tq are the goal, spreading LCA [ LSA ] to improve idle & low speed drivability is a veeeeery counterproductive move. The correct answer is not to spread the LCA, but to go for less duration.'
Also, Richard Holdener recently tested identical cams except for LSA on LS engines. From memory tightest LCA was 108, won overall, & worked fine with the EFI.

I said I have found it to be untrue. I have.
Narrower LSA makes a car want to idle rougher because of less vacuum. Because typically there is more over lap.
I agree less duration will help solve the problem, but that isn’t what you originally said.
If the duration is the SAME, the narrower cam WILL idle rougher. I don’t care what Vizard says.