Tim,
Looking at the 1948-1953 Chevrolet truck shop manual section 6-59 through 6-64. I don't see anything mentioned or pictured with the carburetor spacer. When I removed the carburetor to rebuild it, there was no spacer. I have installed the spacer knowing that it will help to keep the carburetor cool, but questioning the spacer since it was not there before. Going to take a look at the assembly manual also.
Tim
Last edited by fixit1958; 02/05/2016 7:53 PM.