The Wood Performance Knight Prowler BW-4V M8 Valve spring kit was designed by Bobby Wood for 2017-up H-D Milwaukee Eight engines. This kit is absolute top quality and includes 8 springs, and eight titanium retainers. Supports all M8 cams up to .600 lift.
Wood Performance's philosophy is the same that they used to achieve two NHRA national records. IT’S NOT HOW FAST YOU GO… BUT HOW QUICK YOU GET THERE! TORQUE, TORQUE and MORE TORQUE is the ONLY way to put you there quicker and to "Smoke the Competition!" This design and manufacturing process has produced The Most Advanced, Aggressive camshaft profiles for Harley-Davidson Engines available anywhere!!