Industrial Injection 6.7L Cummins Stage 3 Ported & Polished Cylinder Head (2007.5-2018)Industrial Injection 6. 7L Cummins Stage 3 Ported & Polished Cylinder Head with Fire Ring Grooves (2007. 5 2018) The Industrial Injection Stage 3 Ported & Polished Cylinder Head with Fire Ring Grooves is engineered for serious 6. 7L Cummins racers, sled pullers, and high horsepower performance builds. Featuring extensive CNC porting, oversized valves, and premium valvetrain components, this cylinder head is designed to maximize airflow, improve
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