I’m struggling with my .300 flow number for the first time in years but that’s for another post. While searching for that lift issue I had a few extra minutes before I quit so I did back to back tests with two brand new 2.055 Ferrea intake valves. I’m sure I did this many many years ago but I keep better notes now so I will add this to them. I had always heard it help low to mid numbers and may hurt high lift numbers but this is the gain from .100-.600 lift.
.100——-+6
.200——-+7
.300——-+8
.350——-+7
.400——-+5
.450———+5
.500——-+3
.550———+4
.600——-+4