Racers and engine builders of LS Series GM engines now have a brand new, extreme usage (.660" Max Lift) Valve Spring, Spring Retainer, Valve Lock and Valve Stem Seal Kit that safely extends engine RPM and boosts performance capability with normally aspirated or power-added LS engines. Lunati’s new kits feature precision wound, heat-set, dual valve springs, for required seat and open-load pressure plus total spring travel to accommodate cams with aggressive gross valve lifts of up to .660”. The valve springs in each kit are carefully tension matched and all supplied components come complete and ready to install. Included are Lunati’s CNC machined, steel alloy spring retainers, CAD designed to deliver maximum strength and durability. Precision fit spring locators are also included, and are cleverly designed to accurately locate the inner spring, preventing abrasion with aluminum LS Series heads. Precision-machined steel alloy 7-degree valve locks are also provided, for superior valve stem holding reliability. Premium quality, Viton® steel reinforced valve stem seals are included for correct valve stem lubrication and oil control.

Valve Spring Specs:

• O.D. 1.306 inch
• I.D. 0.676 inch
• Max lift: 0.660 inch
• Seat load: 153 lb/in @ 1.810 inch
• Open load: 400 @ 1.150 inch
• Rate: 379 lb/in
• Coil bind: 1.100 inch