Does this prove David Vizard's 128 lsa formula ?

273,
I am not missing any point....& most others aren't either. DV claims that cams sold by cam companies are generally too wide with LSA....because the cam company wants to save the hotrodder from him/her self, so they widen the LSA. DV says the correct way to moderate the function of the cam is to reduce duration.....not widen the LSA because power will be reduced; he has dyno tests in his books. How many dyno tests does he have to do?
Richard Holdener did a LSA comparison on a 5.3L LS engine [ three cams, identical except for LSA ]. The tight LSA cam made more average hp everywhere & IIRC, it actually made a little more at peak hp. So modern engines also like tight LSA. Maybe someone can link it.
Every test I have seen shows tight LSA is better. The late Joe Sherman was quoted as saying 'The tighter I went [ with LSA ], the more power I made '.
Here is yet another LSA test. Long before the 128 rule was known. Three big duration cams in a 350 Chev. Isky cams identical except for LSA: 106, 108, 110.
The 110 made 3 peak hp more than the other two : 583 [110 ], 578 [ 108 ], 580 [ 106 ]. The 106 made peak HP 500 rpm earlier. Average tq through to 7000: 106 was highest, 108 was down 13, 110 was down 23. In percentage terms, the 110 was down 5% on the 106 in average tq.

Much to much criticism of the 128 rule. It was created so that hot rodders didn't have to guess LSA. DV wants you to buy his software program, which gives more accurate results. 128 was a freebie...