This 1/2" thick phenolic riser kit for the Early 1957-65 AFB 4 barrel carb that has smaller primaries and larger secondaries with a mounting pattern of 4-1/4" x 5-5/8" on center. This is found on the early dual quad Chrysler setups and others and was taken from the original pattern.

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. Email for questions at Dashman's Hot Rod & Speed Parts