Plain Plug Gauge for Sleeve ID Go 4.103 to 4.105 Cyl. 0.001 Len. 80 to 81; with tapping of M2; NOGO 4.195 to 4.2 Cyl. 0.002 Len. 10 to 11 / Std. Gauging area should have lapped finish. Gauge No. PPG 4100.4200