Plain Plug Gauge for Sleeve ID Go 2.8 to 2.801 Cyl. 0.0001 Len. 80 to 81; with tapping of M2; NOGO 2.813 to 2.814 Cyl. 0.0001 Len. 10 to 11 / Std. Gauging area should have lapped finish. Gauge No. PPG 2800.2814