M-6250-A443 429-460 Wedge Hydraulic Flat Tappet. Substantial Horsepower increase at high RPM. Production cylinder heads require machining of valve spring seats to prevent "coil bind" w/stock length valves. Pear RPM Torque is 3000, BHP 5000. Duration (2nd # is at 0.050" lobe lift). INT. 300 degrees & 234 degrees. EXH. 310 degrees & 244 degrees. Valve Lift INT. 0.562" EXH 0.588" NOTE: specs & photos can vary