Description

This cylinder head is designed for late-model Cummins ISB 24V engines and replaces OEM part number 3977225. Engineered from high-strength cast iron and precision-machined to OEM specifications, it provides superior valve sealing, efficient airflow, and thermal durability. Perfect for medium-duty diesel applications, this head delivers reliable performance, reduced emissions, and a long-lasting service life. Application: Aftermarket Cummins B Series ISB Notes: 24 Valves Bare Cylinder Head Common Rail Style Key Features OEM replacement for Cummins 3977225 Fits ISB 5.9L/6.7L 24V late-model engines Optimized combustion chamber and intake/exhaust port design Durable cast iron for heat resistance and strength Precision-machined for OEM-style fit and function Compatibility Cummins ISB 5.9L / 6.7L Late 24 – Valve Engines OEM Replacement Part #: 3977225