A few post back people were talking about injector timing. Last fall I put bigger injectors in my Buick 455 (replacing 12 year old ones that two were leaking during a clean and flow test), and decided to play with the injector timing. I swept it in 10º increments 200º and for the most part the response was unchanged until I hit this spot and it dramatically dropped the AFR one full point in a 20º change. Same pulsewidth/duty cycle, so exactly the same amount of fuel going in but more of it was being burned and less fresh air passing through.
Buick 455, roller cam around 215º duration, 0.570" lift and I forget the LSA but low overlap.
https://youtube.com/shorts/E4NuHJmPmcQ
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)