Originally Posted by Superluminal

This is caused by the clutch pedal return spring. The return spring has about the same pressure pushing back as the stock pressure plate, so it all feels the same with a stock clutch. When you put an aftermarket clutch in your car, with a heavier pressure plate, logically the return spring doesn't get tighter because it's part of the clutch pedal assembly. So that play you feel is the return spring not being as stiff as your pressure plate. To offset this you can adjust the stopper on the upper part of the clutch pedal (when it rests in the "up" position). Adjust it down to where there is no more play. However, the downside to this is it will feel like your clutch is engaging at the top because you got rid of the pedal freeplay. On a side note, I am curious as to why most aftermarket clutch kits don't include a return spring that has about the same amount of feedback as the pressure plate, to make the engagment seemless.