The 3971411 6CT cylinder block is heavy‑duty bare cast‑iron main housing for Cummins 6CT 8.3L six‑cylinder diesel engine, double‑thermostat configuration. This bare block serves as the foundation for crankshaft, pistons, cylinder head and all internal engine assemblies. Each 3971411 block is processed by high‑precision CNC machining and 100% hydraulic pressure‑leak testing. Widely used for heavy‑duty truck, excavator PC300‑7, wheel loader and generator engine rebuild. It is the ideal aftermarket replacement solution when original block cracks, cylinder bore wears or water‑jacket leakage appears.
Heavy‑duty high‑strength grey cast iron casting, reinforced internal rib structure, anti‑crack & anti‑deformation under long‑time heavy‑load working condition
Double‑thermostat housing design, strictly for 6CT/6CTA8.3 double thermostat engine assembly, do not fit single‑thermostat 6CT version
Precision CNC machining on cylinder bores, deck surfaces, oil galleries and water passages, direct drop‑in fit without extra machining
100% hydraulic pressure leakage test before shipment, zero‑leak requirement for water jacket and oil passages
Strictly follows Cummins 6CT8.3 original dimension standard, perfectly matches original crankshaft, piston kit, cylinder head, gasket and main bearings
Premium aftermarket quality with ISO‑9001 inspection, cost‑effective for repair shops, spare‑part wholesalers and fleet maintenance
Widely applied on heavy‑truck, construction machinery and stationary generator sets
Remarks: 1).The Cylinder block we produced are suitable for the following Cummins models: Engine Series: A2300, B3.3, QSB3.3, 4BT3.9, 6BT5.9, 6CT8.3, L8.9, L9.3, ISBE, ISDE, ISC8.3, ISL9, QSL9, ISM11, QSM11, L10, NTA855, N14, KTA19, KTA38, KTA50, QSK45, QSK60, QST30, QSX15, ISX15, VTA28, NH220, ISF2.8, IS3.8, QSF3.8, ISG11, ISG12. 2).If your need item can’t find in this list, please contact with us directly to check more information. There is many photos and parts number can’t full show in this website. 3). We slso can do OEM and ODM ,If you have other brand require, we also can offer . 4). For any future information need or question require, please contact us to know more.
