If its blown, turbocharged or nitrous injected, then you need a HNS ring set. With their hardened manganese top ring they can take the pressure. Proven in the harshest conditions. IHRA Pro Mods, NSCA/NMCA Pro Street, NHRA Pro Stock, Top Fuel and Funny Car.

Bore: 4.040
Top ring 1/16 [hard ductile iron, phospate, barrel face, d-wall, torsional]
Second ring 1/16 [iron, phospate, taper face, d-wall, reverse torsional]
Bottom ring 3/16 [carbon steel, chrome, ss50u style]