For Edelbrock Thunder Phenolic Insulator Spacer Carburetor Riser 500 600 650 1/2

This 1/2" thick phenolic riser for the 500-650 cfm 1403 1404 1405 1406 carburetors. Add a little performance to your machine the cheap way, and keep the heat away from the carburetor to solve the heat soak or carburetor boiling issues.