Out of stock
SKU: ALL 54195
UPC: 848238064858
MPN: ALL54195
The Return Spring Kit 4150 Black from Allstar Performance is a precision throttle return spring assembly designed for Holley 4150 carburetors and compatible throttle brackets. This kit addresses a critical requirement in carburetor operation: reliable spring pressure that ensures the throttle plate returns to idle position promptly after acceleration. Mechanics, engine builders, and performance enthusiasts rely on return spring kits to maintain consistent idle quality and prevent throttle hang—a condition where the carburetor fails to return to baseline RPM.
This return spring kit features black anodized aluminum construction, which provides corrosion resistance and a professional appearance while maintaining lightweight durability. The kit is engineered to work specifically with Allstar throttle bracket assemblies paired with Holley 4150-series carburetors, delivering calibrated spring tension that balances responsive throttle control with smooth deceleration. Black anodizing not only protects against oxidation in high-heat engine compartments but also resists fuel and oil exposure, extending component lifespan. The compact design—measuring 4.1 x 1.3 x 4.5 inches and weighing just 0.2 lbs—integrates seamlessly into tight carburetor mounting spaces without adding bulk or complexity.
Street rods, muscle cars, and custom-built engines benefit most from this return spring kit, where carburetor tuning directly impacts drivability. Installation is straightforward for users familiar with carburetor assembly; the kit mounts directly to Allstar throttle brackets on Holley 4150 carburetors without modification. This component is essential for anyone rebuilding a carburetor or upgrading to an Allstar fuel system package, ensuring throttle response remains predictable across idle, cruising, and wide-open throttle scenarios. For serious enthusiasts demanding reliable, OEM-quality performance parts for classic fuel systems, the Return Spring Kit 4150 Black delivers proven functionality at a competitive price.
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