Edelbrock 2.055 (30 degree back-cut) testing

pittsburghracer said

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

Click to expand...

Have you ever done any testing with a 30 degree seat & valve face? I know it's not the best HP setup but I read an article where Dulcich suggests it... He says it improves flow from .100-.400 without hurting flow at higher lift much.... He went on to point out the valve sees that .100-.400 range twice for every one time it sees max lift so gains down low can have a bigger effect than max lift flow... He only suggests doing it on the intake side.... I thought it was an interesting idea... Especially for guys like me who only run 550ish lift cams....