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He's asking about a pressure plate not a clutch disc.
I found this:
Check free length of springs which should be around 2 1/4", but not be less than 2 1/8". All coils should also be evenly spaced If the spring has been too hot the coils on that end (face plate end) will have collapsed and be closer together than the coils on the opposite end and will definitely require replacing. Alternatively you could have an automotive shop with a valve spring tester check the springs for you. It should take around 100lbs at least, to compress the springs to 1 9/16".
I found it in this article:
http://www.ahooga.com/notebook/howto/1/howto1.shtml