every ad i've ever seen for pro 5.0 and even on their website doesn't say what that stupid allen head screw on the side of the tower does! i'm assuming it has something to do with tension on the springs? what does it do!?! oh and i just found out i actually have crane 1.7 roller rockers not 1.6s. what's the stock lift on an 87 cam and what's the formula to see how much more lift these rocker's are gonna give? anyone running these with a stock cam? i want to hear what the lope sounds like! thanks!