Cylinder Head and Block This is cylinder head and block for Cummins 4BT, 6BT, 6CT and 6L engine. Cummins Engine PartsRemarks: ... DESCRIPTION PART NO.CYLINDER HEAD FOR 6L 3945021CYLINDER HEAD FOR 4BTC3966448CYLINDER BLOCK ... pin, cylinder liner, crankshaft, camshaft, cylinder head, cylinder block, connecting rod, main bearing, crankshaft bearing, connecting rod ...