This piston ring set fits 4.375 in. bore V8 engines built with a power adder such as nitrous, a turbo or a supercharger, pairing a file-fit HellFire top ring with a cast iron second ring and a standard tension oil ring.

Speed Pro R-19105 5 Specifications:

• 4.375 in. Bore, File Fit
• HellFire Top Ring, Torsional Barrel Face
• Cast Iron Second Ring, Reverse Torsional
• SS50U Oil Ring Design, Standard Tension