The Crane LS-1 Dual Valve Spring provide increased pressure, does not have a noisy demeanor and prevents any chance of dropping a valve. They are manufactured from high quality spring wire and heat-set for durability. The nominal inner diameter of this valve spring is 1.275 and the outer diameter is 0.937. These springs are suitable for 0.650 lift and with more aggressive ramp-rate cams.
Coated with a rust inhibitor, for corrosion protection
Features an open pressure of 352 pounds and a coil bind at 1.045″
Dyno and spintron-tested and provides power increase with reliability
Avoids internal carnage by preventing a valve drop
Will not reduce the timing as it functions quietly