The closepin theory..

[jake]

 

[kaiserfrazerlibrary]

Pure chance if it works.  These is no technical basis that I can find out from the Ford Motor Company for this use on older V-8 or 6 cylinder engines they built in the 1940's and 1950's.

[kaiserfrazerlibrary]

Never had & never will.   Also, no old cars since taking the job with Ford in Cleveland OH (2009).  Will be looking for a HJ after the next move.

[Terry T]

Some old cars and engines don't need them, e.g., 161 F-head did not have vapor lock problems, so the pins would have solved a problem that did not exist.

To quote a very wise, very old-timer..."if it ain't broke, don't fix it!"

[Terry T]

The differences between the 4 cyl. carb and the 6 cly. carb would not lead to a vapor lock problem, nor prevent one.

[kaiserfrazerlibrary]

Terry was talking cylinders on an engine, not the number of clothespins on the car.

This is what I consider an "old wives tale" as vapor lock is caused by heat.  Vibration does nothing to mitigate heat hitting the fuel line