I have picked up about .2 in the 1/8 so far with the headers posted above. That's over the hooker supercomps. Went from mid 6.teens to low 5.90's in the 1/8. Picked up a couple MPH as well. There not equal length and are 2&1/4 tubes. That's the last thing I have touched on the Valiant. Now I just race it!
I have another cam that's always a tenth faster then what's in it but have not stuck it in. I know it has a low 5.80 in it as it sits. All because of those headers.