Serrated Billet Arm 5/16 1.3 CD

The Serrated Billet Arm 5/16 1.3 CD is a precision-engineered throttle component designed for the rigorous demands of Sprint Car racing and high-performance fuel injection systems. Machined from premium billet aluminum, this Enderle throttle arm provides the structural rigidity required to prevent flex under high-stress mechanical loads. The choice of billet over cast alternatives ensures superior grain density and reliability in extreme racing environments.

For mechanics and tuners optimizing linkage geometry, the 1.3-inch Center Distance (CD) is a critical specification. This measurement determines the leverage ratio between the driver's input and the throttle shaft actuation, allowing for fine-tuned control over engine response. The internal serrations are specifically engineered to interface with a 5/16-inch shaft, providing a positive lock that eliminates the risk of slippage during rapid throttle transitions.

Durability is addressed through a high-quality black anodized finish, which protects the aluminum from oxidation and the corrosive nature of specialized racing fuels. This protective layer ensures that the component maintains its integrity and appearance even after repeated exposure to heat and chemicals. When you buy this throttle arm, you are investing in a component designed for exact fitment and long-term service life in professional racing applications.

Reviewing the technical specifications reveals why the END4011-516B is a standard for many custom linkage setups. Its lightweight 0.04 lb construction minimizes rotating mass, aiding in instantaneous throttle return. Whether you are performing a complete rebuild or replacing a worn component, this serrated billet arm is for sale as a single unit to accommodate various custom multi-arm configurations in professional fuel delivery systems.