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Looking thru the March 1957 issue of Auto Mechanics that has an article on the maintenance for the new '57 Chevy and I quote "Tire pressures should be checked at least once a week, with 22 pounds (24 pounds for heavy loads) being proper for both front and rear when the tires are cold. When tires are warm, the proper pressure is 25 pounds after driving three miles or more below 40 miles an hour, or 27 pounds after driving more than 3 miles at a speed faster than 40 miles an hour." After all these years I always thought 32 psi was the standard.------still learning after thinking I knew it all!!!!!!!!!!!!!
 

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Good find John...Its in the 55 Shop Manual as well:

 

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Yikes! That's a pretty complicated set of procedures. Who the heck can keep up with those requirements?! You would have to carry a tire gauge and air tank. Then with the way those tires held air, you would have to do it all over again the next day! :sign0020:
 
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