The magic of the A&A 440 port manifold is its smaller intake-runner openings, as highlighted by this comparison with a stock Max Wedge intake gasket. But Rick Allison also reduced and massaged the runner sizes inside the manifold to match. This strategy keeps the intake charge moving (high port velocity), a detail that increases its inertia and further enhances the ram effect. This manifold is not recommended for big-displacement stroker applications where it may limit upper-rpm breathing potential. Fear not: A&A also sells an original-size big-port Max Wedge cross-ram (and magnesium Race Hemi cross-rams) for all-out efforts where original appearance is desired.