Speed-Pro File Fit Plasma Moly Piston Ring Set - 4.000" Bore (+.030") - Top Ring: 5/64", 2nd Ring: 5/64", Oil Ring: 3/16", Oil Tension Ring: Standard Boost Controller Duration 281 / 287

Duration 281 / 287

3-5 hour installation time

a heavy-duty Teflon-lines rod end from Viking Performance solidly mounts the arm

Simple setup of features such as the rev limiter with three rotary dials on the face of the unit

Exhaust Connector

Speed-Pro File Fit Plasma Moly Piston Ring Set - 4.000" Bore (+.030") - Top Ring: 5/64", 2nd Ring: 5/64", Oil Ring: 3/16", Oil Tension Ring: Standard Boost Controller Duration 281 / 287Speed Pro designs and engineers pistons to meet the most demanding street performance and racing conditions. In combination, we draw upon more than 100 years of Speed Pro engine mastery to enhance the piston ring and its seal. Our Speed Pro(R) brand is recognized for being a winner in every form of racing, and is the proven horsepower leader in oval track and drag racing. Hell Fire(R) Rings: Speed Pro Hell Fire rings, manufactured from a specially