Use of spark/gas rods & gas adj valve

Posted by Fred Neely on June 08, 1997 at 19:15:08

I've read bits and pieces about use of the spark and gas rods, and the gas adjusting valve.I've read the Model "A" Instruction Book and Service Bulletins.What I want to know is what others have learned by experience.How does road, weather, or engine conditions govern your use of these driving aids?