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Rebuilding a carb for my Pontiac 350 - 17058253

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omaha:
yes, this is totally normal for that carb. I guess the short lived '75-'76 APT could be called an "aneroid" but  I thought it worked with the engines vacuum. (neg pressure??) anyway' when GM did away with this early system, they decided to just put in a plastic cup in place of the device. they did not change the outward appearance (maybe they were thinking about the computerized carbs and its associated solenoid placement way back in 1974). In all reality, it is fairly hard to find a carb with that old APT system. I have found only one so far. I also havw found regular apt "Mod-quads" that had build dates in 1975 so not even all 1975 carbs had the "aneroids".  your carb (should) has the newer style APT with the adjustable step for the power piston.  This is a much better set-up (obviously since the earlier one went away in less than 2 years) It works much better. ...........Don't worry, it;s good!!

sixth_sense676:
Thanks so much! That's a relief.

Book still hasn't arrived yet, so another question...

How much play is too much play in my throttle shaft? I can wiggle them both a tad, back and forth, as well as in and out. Do I need the bushing set, or am I ok?

Thanks again,
   -Derrick

sixth_sense676:
I finally got the book! After looking I decided it would probably be best to go ahead and buy the shaft bushing kit. I need to get some parts for recipe #2 anyways. I want to do this right the first time.

 Just curious, after you sand blast all your parts, do y'all nickel plate them or what do y'all prefer to do? Since its getting blasted inside and out I ruled out carb renew paint - as carb renew wont protect the inside.

omaha:
   If you have a local chrome plater in your area, ask if he has any experience plating carbs. Usually this is some kind of zinc-chromate process.  Not that complicated cpmpared to chrome, just a protective plating. Original carbs were just "washed' with some kind of chemical (dont rermember what) and this reacted to the various metals in the carb. Early carbs were darker 'cause they had more lead in them. later ones were lighter. It takes some ptactice to get the correct look, that is why it is bect to go with a guy that has some experience.
   There might be some other types of plating that would work on the carb that might look good but that would be another question for the plater person.
    As far as paint goes, I think the only type of paint that I have seen that has any lasting durability on a carb would be Dupont Imron. ($$) I have also seen some carbs that were powder coated. this process is also often done at the same plating shops.  I do not knpw if powder coating is affected by gasoline so you will have to look into this. but I have seen this done.
         I always wanted to try black chromate plating. It looks sweet BUT at 20 dollars a pop to try it, the plater has not tried this yet and cannot garuntee how it would come out. Any way good luck!!
   

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