Trick Vacuum Secondary Diaphragm

The Trick Vacuum Secondary Diaphragm by Advanced Engine Design is a precision replacement component engineered for carbureted performance engines running Holley-style carburetors. This secondary diaphragm is essential for mechanics and engine builders who demand reliable vacuum actuation of secondary barrels, ensuring smooth throttle response and consistent fuel delivery under varying load conditions. Whether you're rebuilding a classic muscle car, street rod, or competition engine, this replacement diaphragm restores critical vacuum signal integrity that factory and aftermarket Holley carburetors depend on.

Constructed from durable rubber and steel materials, the Trick Vacuum Secondary Diaphragm is built to withstand the thermal and mechanical stress of engine bay environments while maintaining precise vacuum response. The diaphragm's rubber compound resists fuel vapors and engine heat, preventing the degradation that causes sluggish secondary barrel opening or erratic air-fuel mixture transitions. Advanced Engine Design's design ensures exact fit and function within Holley carburetor housings, maintaining the vacuum port geometry needed for predictable secondary activation across the RPM range.

Experienced carburetor tuners and engine shops rely on this component when diagnosing hesitation, flat spots, or poor transition from primary to secondary circuits. A worn or failed diaphragm manifests as delayed secondary response, richness during acceleration, or vacuum leaks that sabotage idle quality. This replacement is direct-fit for Holley-pattern secondary diaphragm applications, making it ideal for routine carburetor rebuilds, performance tuning, or emergency repairs on the track or street. Compact at 4.65 x 1.3 x 5.85 inches and weighing just 0.04 lbs, installation requires only removal of the old diaphragm and securing the new unit in place—no additional machining or modification needed.