Hearse Posted July 11, 2019 Share Posted July 11, 2019 (edited) When I had the carburetor off I noticed the portion of the baseplate was eroded around the choke heat passage , almost to the point that it is intruding into the primary butterfly casting. I am speaking with Carb John to see if maybe he might have a good replacement carburetor for her. The carb was also missing that steel baseplate gasket that I see a few of you mentioning. I also noticed the choke tube is broke off at the exhaust manifold and I got most of it out of the brass fitting but is there a better way to fully remove it so I can get a new tube in there? who has a good tube for it? I read that on some Riviera's they had the steel tube running into the exhaust manifold then at some point on the way up it has a section of rubber hose in between? then steel up to the carb choke? Edited July 11, 2019 by Hearse (see edit history) Link to comment Share on other sites More sharing options...
KongaMan Posted July 11, 2019 Share Posted July 11, 2019 1 hour ago, Hearse said: When I had the carburetor off I noticed the portion of the baseplate was eroded around the choke heat passage , almost to the point that it is intruding into the primary butterfly casting. ... The carb was also missing that steel baseplate gasket that I see a few of you mentioning. Problem and cause. 1 Link to comment Share on other sites More sharing options...
Zimm63 Posted July 12, 2019 Share Posted July 12, 2019 For replacement tube, try Inline Tube or Classic Tube. One of them have it, I just forget which one I got mine from at the moment. There are two tubes. One to the choke housing and the other to the vacuum side of the carb. I took the manifold off mine and very carefully drilled out the broken ends. Emphasis on very carefullly. Choke works properly now. 1 Link to comment Share on other sites More sharing options...
telriv Posted July 12, 2019 Share Posted July 12, 2019 The OD of both tubes is 1/4" .250" Use a drill bit slightly smaller than a 1/4" DON'T drill down more than 1/2"-5/8" or you run the chance of drilling into the tube in the manifold. Then just twist the remains out. I have used copper tubing in the past with good results & easy to bend/form. Go to the corvette restorers for the insulation on the heat tube. I forgot which one has the correct insulation. I'm sure someone on here knows. Tom T. 1 Link to comment Share on other sites More sharing options...
Hearse Posted July 12, 2019 Author Share Posted July 12, 2019 Thank you very much sir! and to the other's for the imput. I'm a little leary of trying to take off the exhaust manifold it's never been off, has the locking tabs on them still and have california rust on them lol I can see a bolt snapping off in the head . I might try a 90 degree drill bit in the size you said and see If I can get the rest of the broken tube out of there. Link to comment Share on other sites More sharing options...
RivNut Posted July 13, 2019 Share Posted July 13, 2019 (edited) 12 hours ago, Zimm63 said: For replacement tube, try Inline Tube or Classic Tube. One of them have it, I just forget which one I got mine from at the moment. There are two tubes. One to the choke housing and the other to the vacuum side of the carb. I took the manifold off mine and very carefully drilled out the broken ends. Emphasis on very carefullly. Choke works properly now. The tube coming from the carb is not a vacuum line. It comes off the top of the carb at the the air horn and is a filtered fresh air supply line. There is a slight vacuum coming from the choke housing line. Edited July 13, 2019 by RivNut (see edit history) 1 Link to comment Share on other sites More sharing options...
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