150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Speedmaster crankshafts are nitride-hardened

Speedmaster crankshafts are nitride-hardened

Speedmaster TDS stepped up and created a full line of super-strong forged and billet yokes

while giving accurate measurements on your oil capacity

Too little oil causes stem and guide wear

Instead of spending the time and money refurbishing your existing heads

150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Speedmaster crankshafts are nitride-hardenedSpeedmaster coil springs are designed to withstand the high stress levels of modern suspensions. They're manufactured from high quality chrome silicone steel, heat treated and shot peened, and then powdercoated or plated for protection and appearance.