5/16" Base to 7/16" Rocker Stud Set 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

Choose long or short styles in a natural or shiny polished finishes

or street performance

These one-piece Speedmaster pushrods are heat-treated for use with guideplates

5/16" Base to 7/16" Rocker Stud Set The Speedmaster LowRise Manifolds areSpeedmaster arm stud kits are made of 4140 Chromoly steel. They're roll threaded, heat treated to a maximum strength of 190,000+ PSI. and have a black oxide corrosion resistant finish. They feature larger radius stud fillets for extra strength.