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Is there a chance they are just cheap springs and approaching their coil bind at .510?



Coil bind height is listed on our cylinder head specifications page at 1.130". Because the springs use an installed height of 1.875", if you do the math, (1.875-1.130= .745), the springs can be compressed up to .745" before coil bind becomes an issue. This does not mean that they can be used with a .745 lift cam, that's a separate issue related to spring pressures. However, it does tell you that coil bind will not be an issue until you get to .745" lift, which is WELL beyond any application you would ever use a single spring with.