Ford 351C Cleveland Intake Valve Guide (3061) The Speedmaster LowRise Manifolds are

The Speedmaster LowRise Manifolds are our lowest profile manifold and is also the only one that is street legal on pollution controlled vehicles

rear-end housings

or better known to mechanics as the IAC

please note that these supports are designed for drag racing

Speedmaster valve guides are constructed from high-quality bronze for durability and wear

Ford 351C Cleveland Intake Valve Guide (3061) The Speedmaster LowRise Manifolds areSpeedmaster valve guides are constructed from high quality bronze for durability and wear, and built to exacting tolerances, they replace your existing worn or damaged valve guides. These guides are offered in a variety of diameters to suit your application..