I have a 5" Pro Stock style scoop.The fastest I've gone is 117 and the hood lifts up against 6 hood pins.The scoop is sealed,and I have blocked the scoop opening,(using the cover in the picture) to see if the scoop works and I slowed down a bunch doing so.Now I also use a single 4bbl carb,and according to the Mopar race manuals this scoop shouldn't work,but it works fine for me.