Bellmouth Velocity Stack Aluminum 3.5In Inlet O.D

The Bellmouth Velocity Stack Aluminum 3.5In Inlet O.D. from VIBRANT PERFORMANCE is a precision intake manifold component designed for serious engine builders and performance enthusiasts seeking to maximize volumetric efficiency. This velocity stack serves as the foundation of an optimized induction system, channeling ambient air into the engine with minimal turbulence and flow restriction. Whether you're building a naturally aspirated engine, tuning a forced-induction setup, or refining an existing performance platform, this aluminum bellmouth stack delivers measurable gains in throttle response and mid-range torque delivery.

Constructed from lightweight aluminum, this 3.5-inch inlet diameter component features a precision-engineered bellmouth design that transitions smoothly from the intake runner into the combustion chamber environment. The bellmouth geometry reduces flow separation and turbulence at the valve seat, allowing air molecules to enter with optimized velocity and minimal energy loss. At just 0.34 lbs, the component adds negligible weight while its compact 6.5 x 2.75 x 9.5-inch footprint integrates seamlessly into most custom intake manifold configurations. VIBRANT PERFORMANCE's manufacturing standards ensure consistent wall thickness and surface finish, critical factors for achieving repeatable volumetric efficiency improvements across your engine's RPM range.

This velocity stack is ideal for engine builders constructing bespoke intake systems, tuners upgrading factory manifolds, and performance shops fabricating competition engines where every fraction of a percentage in efficiency matters. Installation typically involves integrating the bellmouth stack into a custom or semi-custom intake manifold runner as an inlet transition element. The 3.5-inch O.D. accommodates standard runner sizing found in many LS, small-block Chevy, and popular domestic engine platforms, though verification of your specific manifold design is recommended before purchase. Proper sealing and gasket selection during installation ensure maximum flow benefit and prevent intake vacuum leaks that would compromise the efficiency gains this precision component delivers.