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  1. I have been searching everywhere trying to find consistent (key word) spring rates listed for all the different types of coil springs for our cars. As far as I can tell, the only consistent thing I have found is that the "620" springs everyone has talked about are called that because the diameter of the spring metal is .620", but even with regard to the "620's" I have read inconsistent information about what the spring rate actually is. I have seen everything from 560 in/lbs to 600 in/lbs. So many sellers of various springs might tell you the application they are for, but few to none say what the actual spring rate is. The reason I am interested in this is because I have been looking for a new set of springs that are roughly 20-30% softer than what I have :http://opentrackerracing.com/product/performance-coil-springs-1967-1973/ . I say 20-30% because I plan on doing the spring perch relocation, and because my cars front end is already at the tolerable limit of stiffness I will not do the relocation without softer springs. Those familiar with this mod know that it allows you to run a lighter spring but the effective spring rate can be the same. I don't know the exact % difference that would be ideal, but the threads I have seen estimate around 20% or so...I know I can't be exact as far as finding the perfect stiffness, but if the springs above are 600 in/lbs that would mean I am looking at a range between 420-480in lbs.
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