my 68 form. S came stock w/ 3/8" line. it now has -08 , which is really 7/16" I.D. to the regulator up front, then 3/8" ( which is really 1/4" I.D.)to each end of the carb. ( will be a 950 quickfuel). some of my dragracer friends run bigger than that! ------------I`d SAY 3/8 MINUMIM--------bob:coffee2:
