Current Lead Times: In Stock Engines Ship Same or Next Day - Out of Stock: 1-3 Weeks on Most Long Block Engines; 3-5 Days on Heads – *call us for more exact lead times for your specific build 
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Cylinder Heads

Duramax cylinder heads hold the intake and exhaust valves and fuel injectors. They also provide passages for air and fuel flow. These heads seal the top of the combustion chamber. They control airflow, compression, and engine performance.