Posted on April 1, 2021 Home » Cummins 4BT » Cummins 4BT – Blowby Conversion Chart (5.613 mm [0.221 in] Orifice) Cummins 4BT – Blowby Conversion Chart (5.613 mm [0.221 in] Orifice) Related Posts Cummins 4BT - PISTON PROTRUSION Cummins 4BT - Coolant Loss Cummins 4BT - Coolant System Cummins 4BT - Coolant Contaminated Cummins 4BT - Compression Knocks