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at the risk of being labled a 'believer' or 'non believer' of the phenomemon of vapor lock, I will simply state some comparasions between my 3 Model A's. all have engine pans, Zenith carbs that run nice, and stock distributors with modern style upper plate. Although I do not know what the operating water temps are, I do not have overheating issues. paper gaskets to bolt on the carb. While no two engine compartments will be truly equal, these are probably as close as they come and my driving habits would be about the same. The first two A's have never had a vapor lock condition even on the hottest days here in lower Michigan. The third one is guaranteed to vapor lock at temps close to 90 and higher. City driving with stop lights or starting up a hot engine, it will sputter for half mile untill things clear. My only effort in attempting to tame the vapor lock beast on number 3 was a carb swap from one of the others. Maybe someday I will go a little further and try a rubber gas line, pot metal carb, heat shield, or.... Sometime when I run out of things to ponder, I will ask the the big question 'why don't my first two A's vapor lock?' It is rather fun to experience with a rookie passenger and I'm saying get ready to hop out and push.
