Made from .080? wall carbonitrided seamless chrome moly tubing, Signature Series Pushrods are specifically designed for serious street performance and race applications. The swedged ends add material in the tip, which is vital for maximum strength and durability. Signature Series Pushrods are heat treated to eliminate the possibility of stress fractures and then finished wit h a black oxide treatment, creating the ultimate option for high horsepower and high RPM engines.