Piston ring end gap — standard and maximum (NA6)

End gap Top: 0.006–0.012 in (0.15–0.30 mm) Second: 0.006–0.012 in (0.15–0.30 mm) Oil rail: 0.008–0.028 in (0.20–0.70 mm) Maximum: 0.039 in (1.0 mm)End gap Top: 0.15–0.30 mm (0.006–0.012 in) Second: 0.15–0.30 mm (0.006–0.012 in) Oil rail: 0.20–0.70 mm (0.008–0.028 in) Maximum: 1.0 mm (0.039 in)

Insert the ring in the cylinder and square it with a piston at the bottom of ring travel as directed on B–56, then measure end gap with a feeler gauge.