Product Description 6BT engine piston ring, ISB RING SET, 3802230 3802421 3802040 6 Top 102mm 3 mm 3802230 6BT/4BT 2nd 2.5 mm 3802421 O 4 mm PARTS SHOW FOR CMS ENGINE PISTON RING CMS 6B/BT/BTA 5.9 (ISB/QSB 2-vlv) Diesel 359 CID; 12 valve head (Continued) 6 Cylinder Stroke Bore 102mm 120mm ...