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Discussion Starter · #1 ·
Just bought a used k8 gsxr 1000 head for a good price. Seller said it already has hd valve springs in it. Any way to visually tell by just looking at the springs? They are suppose to be APE springs(VS1000S) Thanks for any help
 

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easy, stock springs are progressive wound coils with coils tighter at spring base, hd springs coils are evenly spaced. allows greater lifts before coil bind.
 
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