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Old 01-09-2009, 07:13 AM
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Holley 4160 (0-3310) question

I have a 1968 GT with no history or info from previous owner. I was having some trouble with excelleration after the 2nd tank of gas and found I had a bunch of debri in the tank. So I replaced the tank and fuel lines and pump.

Note: I am weak when it comes to carburators knowledge!

I am getting ready to rebuild the Carburator it is a Holley with 0-3310 stamped near the choke plate (no other numbers that I could see). I believe this is a 4160 with vacuum secondaries (since it has the diaghram on the side) and manual choke that isn't connected to anything. When I started checking the carb I was checking the float settings and I noticed that the gas in the secondary float area looked really old. And I noticed that all of the vacuum ports (3 or 4 of them) have rubber boots over them and are not connected to anything on the engine.

Does this mean that he secondarys will not function?

or

Should they function without any of these ports connected and there is an injector or nozzle plugged on the secondaries causing the gas to never flow?


Thanks for your help.

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Old 01-09-2009, 08:40 AM
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The vacuum source that operates the secondary diaphragm is internal and the plugged ports that you see have no bearing on secondary diaphragm operation. If you decide to rebuild the carb, FWIW purchase a quality rebuild kit. DO NOT buy a house brand kit. Some of the best kits available are of course a Holley kit, second would be a Borg Warner kit.

Vince
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Old 01-09-2009, 10:00 AM
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It Sounds your secondary is not functioning during hard acceleration. I would remove the diaphragm housing off the carburetor and check to see if no damage to the diaphragm itself. Be careful when taking it apart because there is a check ball in the housing. There is a cork like gasket between housing and the carburetor. After checking the diaphragm for any damage carefully reassemble it. Make sure the four holes on the diaphragm line up when mounting the screws. You can tear the diaphragm if not line up. After assembly press the diaphragm rod in and put finger on the vacuum port of housing. If the diaphragm rod does not return back, you’re OK. While having the housing removed check if the secondary throttle plate is not jammed. Hope this help you.
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Old 01-09-2009, 10:37 AM
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Before removing the vacuum diaphragm to inspect it (and risking damaging something before your ready to rebuild it), try this. Get a small paper clip or wire of some sort (I have even used welding wire) and wrap it around the shaft of the diaphragm and make sure it is as high as it can go on the shaft against the diaphragm housing. Make sure it can't actually go into the housing. Make sure the clip doesnt move real easy. Drive the vehicle and floor it! Stop and check the position of the paper clip. If the secondaries are opening the paper clip will be lower on the shaft. If not, the paper clip will have not moved. It's quick and easy.

On a side note: You must drive the vehicle and put a load on the engine or the secondary will not open. A vacuum sec. Holley will almost never open the secondaries by revving the engine in park with no load. Good luck
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Old 01-09-2009, 10:38 AM
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well you guys beat me to it
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Old 01-09-2009, 12:57 PM
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Thanks for the reply. I will check it out this weekend.
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