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Mod | | | Forums66 Topics128,065 Posts1,055,870 Members48,428 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Village_Idiot, that hole should be open to vacuum. That port controls the power valve in the carb, if there is little or no vacuum applied to that port the power valve in the carb will open and allow more fuel into the intake manifold. A friend of mine could not get his 52 Chev to pass emitions, and when we pulled the carb the single hole gasket was not augmented to expose the port to vacuum, once the gasket was installed correctly the car breezed through the emissions test. The gasket manufacturers decided it would not effect the operation if they put four holes or slots in the gasket to make it pardon me "idiot proof", I hope that answers your question. | | | | | Joined: Oct 2010 Posts: 1,232 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 1,232 | Village_Idiot, I believe that Chevs of the 40's has a carb gasket (#3712549), and carb insulator (#3692799) that will work for your carb.
- Lonnie My '54 3104Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post. lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt. OLD STUFF ... houses, furniture, cars, wine ... I love it all | | | | | Joined: Jul 2010 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2010 Posts: 127 | I have a gasket and insulator that match the base of the carb, but thanks for the links. I just thought it was odd that it was covered when I took it off to be rebuilt.I am going to use the new gasket.
Jessica's TruckThe true definition of insanity: To do the same thing the same way repeatedly and expect a different result each time. | | | | | Joined: Apr 2011 Posts: 57 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2011 Posts: 57 | The 1/8 inch line from the throttle body to the distributor supplies vacuum to advance timing. | | |
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