Billet Metering Block - Standard Calibration

The Billet Metering Block - Standard Calibration from Quick Fuel Technology is a precision fuel delivery component engineered for serious carburetor tuning and performance builds. Designed specifically for Holley 1850, 3310, 4776, 4777, 4778, and 4779 carburetors, this metering block sits at the heart of fuel atomization and engine response. Whether you're restoring a classic muscle car, dialing in a street-strip hybrid, or fine-tuning a competition engine, the metering block directly controls how much fuel reaches your engine under varying load conditions—making it critical to overall drivability and power output.

Machined from aluminum and finished in red anodize for corrosion resistance, this billet metering block provides exceptional durability and heat dissipation in high-demand engine environments. The standard calibration is pre-set to deliver balanced fuel metering characteristics across the primary circuit, eliminating guesswork for builders who want bolt-on performance without extensive jetting trials. Aluminum construction keeps weight minimal—just 0.65 lbs—while the precise billet manufacturing process ensures tight tolerances that maintain consistency across multiple throttle positions. The included gaskets and vent baffle support proper fuel separation and prevent vapor lock, critical for reliable operation in both street and track conditions.

This metering block is ideal for engine builders, transmission shops, and enthusiasts upgrading carbureted platforms or maintaining vintage Holley carburetor systems. Installation is straightforward on compatible four-barrel carbs, and the standard calibration typically requires no secondary tuning for mild to moderate builds. Serious racers and highly modified engines may opt for custom calibration blocks, but the standard version delivers excellent results for street performance, restorations, and entry-level competition applications. Verify your carburetor model before ordering to ensure correct fitment.