Chev / Holden LS1 LS2 LS3 L98 V8 Holden Commodore & HSV VT-VF Dual Valve Spring Kit.650" Lift PAC Racing Springs PAC11905KX-KIT

PAC racing valve springs employ cutting edge technology in material advancements and processing resulting in superior race track results and reliability. PAC provide unparalleled attention to detail; from design to manufacture and customer satisfaction, in fact no detail is left unnoticed. This particular set of dual valve springs is truly the tip of the spear. Shotpeened for superior resistance to wear and fatigue, and capable of happily handling aftermarket camshaft grinds up to a massive.650" valve lift (with 1.7 rocker ratio), you need look no further for the toughest valve springs on the market. This kit also features matching Steel Valve Spring Retainers, locators and set of quality valve locks and valve stem seals. The stiffer PAC 1905 dual valve springs help prevent both valve float and valve bounce. Valve float is an adverse condition which can occur at high engine speeds when the valve does not properly follow the closure phase of the cam lobe. This reduces engine efficiency and performance, and represents a significant risk of severe engine damage due to valve spring damage or pistons contacting the valves. They also negate valve bounce which is a related condition where the valve does not stay seated due to the combined effects of the valve's inertia and resonance of metallic valve springs that reduce the closing force, and allow the valve to re-open partially