Dyno Trick Box Stock Clone Valve Spring (10.8lbs @ .850 spring height). Provides additional spring pressure at max lift. These have been updated to heat treated for 2013 and also takes full advantage of the new clone valve spring rules.
New Improved Hardened (each)
NOTE: These springs are the same as the DCS-BSHM pre tested spring but without the pre testing. Marked with green stripe.