A maintenance manual for year of truck or year of motor will have that info.

Ein Wartungshandbuch für das Jahr des LKW oder das Jahr des Motors wird diese Information haben.

This online information may help.
http://chevy.oldcarmanualproject.com/shop/1955truck2/55ctsm0621.htm


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn