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Think of it this way, your valve springs are the "suspension" of your valve-train...... And just like the springs that hold your GN up use shock absorbers to control and dampen the bouncing.....your valve spring needs something to dampen or control the springs natural tendency to vibrate or bounce...... The damper you asked about provides this by causing mechanical friction to calm the spring down..... Stock turbo buicks use a "bucket" on the outside of the spring to accomplish this........ And yes your friend is wrong the inner damper adds a small amount of spring pressure but its true intent is to dampen...... I have seen inner spring dampers break many times even when there is no coil bind, more so on dual spring setups that use a damper... I am not a big fan of springs with dampers because of this..... But if your running a single spring you need something in there to dampen....And if you are using titanium or aluminum retainers the damper will act like a carving tool and chew up your hi-dollar retainers........dual spring set-ups use springs with different vibration frequencies that cancel one another out to calm the spring bounce down....... Check out this video.....pretty much sums it up.
