.660-Inch Polished Dual Valve Spring Kit w/ Titanium Retainers

The Texas Speed .660" polished dual spring kit provides advanced valvetrain stability for high-performance builds, utilizing premium PAC Racing springs engineered to support aggressive hydraulic roller camshafts. Each kit includes American-made, polished dual valve springs, titanium retainers, and the patent-pending Precision Race Components integrated seat and seal. This integrated design eliminates the need for specialized installation tools and prevents common issues like seal tearing or displacement, ensuring consistent operation and long-term durability. Technical specifications include a maximum lift of .660", an installed height of 1.810", and coil bind at 1.015". The springs provide 160 lbs. of closed pressure and 415 lbs. of open pressure at maximum lift. Note that this kit utilizes GM factory valve stem locks, which are not included with the package. Compatibility is strictly limited to applications with factory-size valve guides. This kit is not compatible with LS7, LS9, or any Gen 5 LT1/LT4 engine applications. Furthermore, this kit is not compatible with aftermarket cylinder heads utilizing bronze valve guides. Proper installation requires professional attention to ensure correct spring height and seating.