Hi, just replaced the Rochester QuadraJet carb on my 1970 Corvette with another one. It has a small tube about an inch long sticking out on the front, drivers side, looks like some vacuum tube that should have a hose on it. Car runs fine but was wondering what it is for. The PCV valve hose hooks up on the other side. Any idea what is supposed to go here? Thanks
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Re: Rochester Carburetor
distributor vacuum advance i would guess. what is the number stamped on the drivers side of the carb above the secondary throttle shaft? -
Re: Rochester Carburetor
Don and Clem-----
Yes, usually the small 1/4" nipple on the lower driver's side is for the distributor vacuum advance. However, I don't think that 1970 used this location for distributor vacuum advance. 1970 California Corvettes used this port for the evaporative emission control system (EEC). I don't think that non-California carbs had the port, but they may have had it with a cap.
Also, a SERVICE carb or an incorrect carb, may have the port. So, we get back to Clem's question of what number is on the carb?In Appreciation of John HinckleyComment
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Re: Rochester Carburetor
I have a 70 California carb and has that vac connection. Another one is at the right side. Those vac connections go to the TCS solenoid 4432 (base engine) in the pass side of carburetor/manifold. There is no vac connection at rear as other Qjet have. Mine is 7040503.
Roberto, NCRS #30019, RMCComment
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Re: Rochester Carburetor
The number on mine is 7056212ABH and then the number below it is 1877. It is a remanufactured carb. Does this help determine what the port is for? Thanks for the help.Comment
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Re: Rochester Carburetor
the 7056212 is a 1976/77 454 truck carb and i would think the fitting in the driver side front would be for the distributor vacuum advance if it is just above the throttle base plateComment
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