Hastings "Tough Guy" Racing File-Fit Piston Ring Set - Bore Size: 4.000" Top Ring: 5/64", Second Ring: 5/64", Oil Ring: 3/16" - Oil Ring Tension: Standard RG10003M 10:1 to 20:1 AFR range

10:1 to 20:1 AFR range for gasoline applications

Color Screen

Fits custom models from 1964 to 1972 including Chevrolet Chevelle and wagon

Ford Mustang 1993

Unlike some aftermarket heads

Hastings "Tough Guy" Racing File-Fit Piston Ring Set - Bore Size: 4.000" Top Ring: 5/64", Second Ring: 5/64", Oil Ring: 3/16" - Oil Ring Tension: Standard RG10003M 10:1 to 20:1 AFR rangeHastings racing piston rings deliver race winning performance in even the most extreme applications. The low tension, low friction design provides unsurpassed combustion seating and exceptional sealing. Each set includes plasma moly, high tensile cast iron top rings; reverse twist, taper faced cast iron second rings, and choice of standard or low tension Flex Vent stainless steel oil control rings. Low tension oil rings make significant increases in