I had problems with my Camaro with a mild 350 having vapor lock issues for years. I changed to a three core radiator, shielded fuel lines from headers, wrapped fuel lines, spacer under carb. I could see my see through fuel filter not being full and having bubbles. I would shut down, pull air cleaner and watch hissing fuel push out and onto the butterfly plates of carb. Scary. I went to non-ethanol premium and never an issue again! I run the same in all my classics for that reason, plus the crap that happens to your carb with the ethanol crap.
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