Trick Flow Specialties 16905-16 LS Dual Valve Springs, 1.300 in. OD, 392 lbs.

Valve springs compress and rebound hundreds of times a second. Make sure your next set of valve springs are built to last—and built to win! Trick Flow® by PAC Racing dual valve springs are specifically designed for cams with aggressive profiles, and are available with damper coils for extra spring surge prevention. PAC springs are CNC coiled from high tensile-strength, extra-durable Pacaloy chrome-silicon steel and double shot-peened beyond Aerospace Material Specifications (AMS) reliability standards.
 
Number of Springs Per Valve: Dual
Maximum Valve Lift (in.): 0.660 in.
Retainers Included: No
Outside Diameter of Outer Spring (in.): 1.300 in.
Coil Bind Height (in.): 1.065 in.
Damper Spring Included: No
Spring Rate (lbs/in.): 392 lbs./in.
Inside Diameter of Outer Spring (in.): 0.950 in.
Inside Diameter of Inner Spring (in.): 0.694 in.
Locks Included: No
Valve Stem Seals Included: No
Valve Springs Coated: No
Quantity: Sold as a set of 16.
Notes: Up to .660 in. lift @ 1.800 installed height.