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36 Posts
ok so im split between needing to get heavy duty valve springs or not. i have one person telling me i need them and another saying stock one will work just find. Im putting JE drop in pistons in my 2008 zx10r and my compression is going from 12.9:1 to 13.7:1. so ive been told i need heavy duty springs by one person and i dont need them by another. i dont want to spend the money if i dont have too. can you guys help me out with this plz