.660" Dual Valve Spring Kit with Titanium Retainers

The Texas Speed & Performance .660" Dual Valve Spring Kit is engineered for Chevrolet Gen III IV 5.3L, 5.7L, and 6.0L LS engines, providing enhanced valvetrain control for aggressive camshafts. This kit includes American-made PAC Racing polished dual valve springs with a .660" lift rating, titanium retainers, and a patent-pending Precision Race Components integrated seat and seal. This innovative design simplifies installation by eliminating the need for special valve seal tools and preventing common installation errors like tearing or dislodging seals. The integrated seat and seal are compatible with factory-size valve guides. The polished finish on the PAC valve springs increases their overall lifespan and reduces the risk of fatigue and failure, all while maintaining full spring pressure. These springs offer excellent durability and stability, making them a reliable choice for performance applications. The kit utilizes GM factory valve stem locks, which are not included with the kit. Important compatibility notes: This dual valve spring kit will not work on LS7, LS9, any Gen 5 LT1/4 engine applications, and most aftermarket cylinder heads that feature bronze guides. The integrated seat and seal are not compatible with any aftermarket bronze guide applications.