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Jul 21st, 2025 | | | | Joined: Jun 2003 Posts: 546 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 546 | 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
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | Larry Isgro Carburetors Inc
1604 Argyle Rd,
Wantagh, NY 11793
(516) 783-1041
Larry can work with the adjustable main jet or he can set you up with a jet size that he thinks might match your engine/etc. | | | | | Joined: Jan 2015 Posts: 910 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 910 | There is a member here "carbking". I did not know of him or his business. I had bought a rebuild kit from my FLAPS. When taking the carb apart I saw a small bent spring steel piece left on the rebuilding tray.
There was so much dirt on the carb that when I took off the idle speed screw it was not seen by me. Normally that part would of been seen and would of came of as the screw was removed.
Any way he responded to my thread and he knew what that part was by my description and measurements and told me what it was and I was not even a customer.
If tclederman recommends someone then they must be good too. So contact both and see. | | | | | Joined: Aug 2014 Posts: 176 I have more zippers then a pair of cargo pants | | I have more zippers then a pair of cargo pants Joined: Aug 2014 Posts: 176 | http://carbcoinc.com/ in St Louis does a complete rebuild, bushing & all and will advice you of any vacuum pull offs or solenoids that should be replaced. He also runs all his rebuilt carbs on a engine before the customer gets them back. I watched him run on the engine & adjust it everything for me...joe Carbco Inc Owner is Darrell Howard 9535 S Broadway, St. Louis, MO 63125 Phone:(314) 544-3020
~ Joe
Donate Blood, Plasma, Platelets and Sign Your DONORS CARD. The Life You SAVE Might Be Someone You Know and LOVE.
Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying. ~ Arthur C. Clarke | | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Zenith 11475B is an aftermarket replacement carb, and the adjustable main jet is an integral part of the calibration. Do not replace it on this carburetor.
And 32vid - thanks for the recommendation, but carbking is too busy in the manufacture of kits to rebuild carbs. Have not done one in almost 4 years. The kit business keeps me busy.
But if it were my own carb, and I didn't wish to do it myself, I would send it to Classic Carbs in Phoenix, AZ. Of all those mentioned in this thread, they are probably the most expensive; but I have seen the work of most mentioned, and Classic is THE best! If you send it to Classic, be prepared for a LONG wait. I am not the only one that thinks they are the best.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Jun 2003 Posts: 546 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 546 | Thanks everybody.
I will report back no matter which way I end up going.
Jeff
"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
| | | | | Joined: Jun 2003 Posts: 546 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 546 | I went with Larry Isgro as recommended by tclederman.
I called and spoke with him on the phone. Really nice guy. When I asked about payment, he told me I could pay after I got the carb back. I knew then he was an honest business man.
I sent him the carb and a check on a Friday. Got it back on Monday 10 days later. The carb looks brand new.
I installed it and after turning the engine over a few times it fired right up. Later starts were immediate.
I highly recommend Larry Isgro due to quality of work, turnaround time, and cost. Rebuild cost for my carb was 165 + 15 shipping. $180.00 well spent.
"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
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