Trick Jet Extensions w/ machined Float

The Trick Jet Extensions w/ machined Float from Advanced Engine Design are precision carburetor tuning components engineered for serious fuel delivery control on Demon, Holley 4150, 4160, and 4500 platform carburetors. These secondary jet extensions exist because stock carburetor circuits often lack the fine adjustment range needed for optimized fuel metering across the RPM band—especially in modified or high-performance engines where intake manifold vacuum and air velocity vary significantly. Mechanics and engine builders rely on quality jet extensions to dial in air-fuel ratios without swapping entire carburetor units, making them essential for budget-conscious performance tuning.

The machined float design and notched construction enable repeatable, leak-free fuel supply to the secondary circuit while maintaining precise float bowl level—critical for consistent jetting across throttle transitions and load conditions. The push-on configuration allows fast installation and removal for quick tuning adjustments in the shop or at the track. Advanced Engine Design's Nitrophyl material selection resists fuel degradation and corrosion, ensuring longevity in both street and racing applications where ethanol-blended and premium fuels are standard. The compact 0.08 lb package integrates seamlessly into existing carburetor assemblies without modification to the baseplate or float bowl housing.

Performance tuners, drag racers, street rodders, and engine builders benefit most from these extensions when transitioning to larger displacement engines, different cam profiles, or modified intake geometries that demand secondary fuel circuit recalibration. They are ideal for carburetor enthusiasts troubleshooting lean-condition hesitation or rich-condition stumble without expensive carburetor overhauls. Installation is straightforward for anyone familiar with carburetor assembly; simply remove the secondary circuit cover and push the extensions onto existing jets, then reassemble. Compatibility is confirmed for Demon and Holley 4150, 4160, and 4500 carburetors—verify your specific model and jet size before ordering to ensure proper fit and fuel metering characteristics.