I just moved to Florida and have been experiencing a vapor lock on my carburetor equipped 351-W. I changed the thermostat to a lower temperature, installed a heat shield under the carburetor with a new phenolic wood spacer. This made a slight improvement to the problem, but didn’t eliminate it.

In speaking with Holley they said it was the lousy fuel down South with the high content of alcohol in the fuel. They said to install an electric fuel pump with a pressure regulator and a return line.

In talking to people at a local car show who owned Corvettes, an MGB, Dodge Hemis and even motorcycles said they have been having the same issue and have resorted to running E-90 alcohol free fuel. Its not easily available and cost a lot more.

What are you Southern guys doing.