Thanks Stubby, I presently have a fairly thin gasket between the carb spacer and the bottom of the carburetor, as well as a much thicker gasket between the manifold and the bottom of the carb spacer, but like I mention in a previous post, the instructions that came with a carburetor rebuild kit seemed to imply that a gasket was not necessary between the spacer and the carburetor. The instructions refer to a "Heat Insulator Block" which I take to be the same thing as the 'Phenolic Carb Spacer".????? Are they not one in the same??? Thanks, James