Cylinder Block This is cylinder head and block for Cummins 4BT, 6BT, 6CT and 6L engine. Cylinder BlockRemarks:cummins engine cylinder blockOEM service offered, design service offered and buyer ... 6CT39393131. We manage in auto engine valve, piston, piston ring, piston pin, cylinder liner, crankshaft, camshaft, cylinder head, cylinder block, connecting rod, main bearing, crankshaft ...