I have a Zenith 11475B on my 57 GMC stock 270.
I have had the truck for 11 years and have never done anything to the carb accept some minor adjustments.
Due to failing eyesight and a knack for losing small parts, I want to send it to someone to have it professionally rebuilt.
I found Carbs Unlimited at Carburetion.com and Nationalcarburetors.com Both say they can rebuild my carb.
Does anyone have any experience with either place?
Also, my carb has an adjustable main jet. Should I eliminate that, and if so, what size jet should it have?

Thanks for any and all comments.

Last edited by jmoore; 07/27/2015 12:45 PM.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150