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Comp Cams offers these top-of-the-line dual valve springs. They are a 1.300" spring that is good up to .650" lift. Springs can be used in the most extreme applications when paired with other high quality parts such as titanium retainers. Note that only titanium retainers can be used with these springs.

Specs are as follows:

I.D.: .655"
Seat Load: 135 @ 1.770
Open Load: 400 @ 1.220
Coil Bind: 1.040
Rate (Ibs/In): 408

Complete kit contains (16) dual springs.