I have a military 270 that has that tube. Not sure what it's for.

I'd suggest going to http://www.oldgmctrucks.com/ , sign up for the forums and post the question there.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.