Our Phenolic Spacers/Insulators are designed to  reduce heat soak (transfer of heat) from the intake manifold, which in turn keeps your carburetor cooler, there-by reducing the likelyhood of troublesome vapor locks and/or other associated problems.  The 3/16" adaptor works with all Autolite and/or Holley 2V carbs up to 350CFM, while the  1/2" spacer works with 2V carbs up to 500CFM. Please specify size when ordering (see options).

Fits all Autolite and/or Holley 2V carburetors.

Note: To our knowledge, Classic Inlines is the only company that offers a spacer specifically designed for a Holley 350 CFM carb.