PAC Racing Springs PAC1219 Pac Racing Ovate Beehive Valve Springs suit Chev LS1 LS2 LS3 .625" Lift

  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. 
  The 1200 series beehive valve springs use a premium alloy that out performs automotive industry standards to ensure the springs maintain the load needed to withstand the rigors of street performance and mild racing applications. 
Additionally PAC Racing Springs processes these springs to aerospace shotpeening standards to allow for superior resistance to wear and fatigue, and they are capable of happily handling aftermarket camshaft grinds up to a massive .625" valve lift (with 1.7 rocker ratio).
  The stiffer PAC 1219 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. 

Application: Chev / Holden LS1 LS2 LS3 V8

Valve Spring Style: Beehive
Number of Springs Per Valve: Single
Mass (g): 67.0
Large End I.D. (in): 0.885
Large End O.D. (in): 1.207
Install Load (LB): 135.0
Install Height (in): 1.800
Open Load (LB): 348.0
Open Height (in): 1.175
Coil Bind Max: 1.100
Lift Max (in): 0.625
Frequency Base (CPM): 31258
Quantity: Sold as a set