Small Block Ford Aluminum Manifold and Riser Kit 

Small Block Ford Aluminum Manifold and Riser Kit

These manifolds have individual primaries for more torque and horsepower over your stock center rise or log style exhaust manifolds.  This is a great choice as an upgrade from log style manifolds. These manifolds have a steep down slope originally designed for jet boat applications.  Riser fits 3-1/2" exhaust hose. From center of exhaust port to end of riser is 13-1/2"