Professional Engineering & Rigorous Quality Assurance Engineered for the high-intensity demands of the Isuzu 6RB1 engine, this rocker arm (Part No. 1-12611170-6) is the ultimate solution for Hitachi EX400-5 owners and heavy-duty distributors. We understand that for mining operations and large-scale fleets, any deviation in valve timing leads to catastrophic engine failure. Our rocker arms are manufactured using precision-forged steel and advanced heat-treatment processes, ensuring exceptional fatigue resistance and surface hardness. By choosing our components, wholesalers and agents can confidently offer a product that matches OEM performance standards while significantly reducing the Total Cost of Ownership (TCO) for end-users.