Speed-Pro File Fit Plasma Moly Piston Ring Set - 4.000" Bore (+.045") - Top Ring: 1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Oil Tension Ring: Standard HS11PA Built-in RPM converter (direct frequency

Built-in RPM converter (direct frequency or with optional inductive clamp)

4 x 2 in Primary Tubes

The best Dial Board on the market just got better

Fits 4165/4175 Series Carburetors Will not fit 4150/4160 Series Carburetors

1/4 to 3/8 in Grip Range

Speed-Pro File Fit Plasma Moly Piston Ring Set - 4.000" Bore (+.045") - Top Ring: 1/16", 2nd Ring: 1/16", Oil Ring: 3/16", Oil Tension Ring: Standard HS11PA Built-in RPM converter (direct frequencySpeed 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 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 Rings: Speed Pro Hell Fire rings, manufactured from a specially hardened