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During the 1960s I recall that certain cars, such as Volvo and Mercedes Benz, tended to have a particular problem with vapor locking, especially during the hot summer months. I worked pumping gas in a service station in San Marino, Calif. as a teenager then and we could not figure out what the problem was with those cars. Personally, I never had a problem with vapor lock in my 1960 Ford Sunliner, but then my car always took premium gas, which it consumed like a drunk on a binge. I used premium gas in my 1955 Clipper (with the 352 V8), along with a bottle of lead substitute when I fill up my tank. Seems to run real smooth that way.