Small Block Manifold Riser Spacer () with gasket and donut for various 66-80 for Chevrolet models for Camaro for Chevelle Nova Corvette Monte Carlo El Camino etc. Check at your end that this is the right size and hole spacing to go with the manifolds that you are using. This is a spacer, or riser , not a functioning riser.
ID 2"
Installs on the RH side
Hole spacing 2 3/4" center to center
About 1" thick. (Flat surface to flat surface.)