Plain Plug Gauge for Sleeve ID Go 2.903 to 2.905 Cyl. 0.001 Len. 80 to 81; with tapping of M2; NOGO 2.995 to 3 Cyl. 0.002 Len. 10 to 11 / Std. Gauging area should have lapped finish. Gauge No. PPG 2900.3000