3367 Holley Running Rich
My 66 sat too long and when I started it, it leaked gas. I ordered a Holley kit and put it in. When I reinstalled the carb and started the car, It ran really rich. I went through setting the mixture screws without any change. I turned both mixture screws all the way in and nothing. I took the carb off and checked all the orifices on the metering block and insured that all were open including the matching holes on on the carb body. I also insured that both gaskets on the front bowl lined up properly. Help! Thanks
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Re: 3367 Holley Running Rich
It may be a blown or leaking power valve. -
Re: 3367 Holley Running Rich
the new holley blue gaskets are very hard and do not seal well unless the carb surfaces are flat. i prefer the brown paper gaskets that has thermosetting material on the gaskets if not machining the surfaces flat. the gasket between the main body and the throttle body can be made to seal better by doubling up those thin gaskets. also make sure the power valve gasket is seated properlyComment
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Re: 3367 Holley Running Rich
Double check the power valve gasket for the correct style as this could leak, it's probably not your problem but keep it in mind.
Double check that the air bleeds on the top of the carburetor are open, use a small drill bit or a pin to push in the small hole and carefully blow some carburetor cleaner in there. Watch your eyes and the paint..
If you can turn the emulsion screws in and the engine still runs it's a sign there is a internal gas leak. Engine vacuum is finding gas and pulling from somewhere where it's not supposed to. The problem is usually from what Clem suggested with flat surfaces on the main body, throttle plate surfaces.
If the carburetor is a 4160 with a metering plate in the secondary, that sandwich of gaskets can cause a problem as the metering plate usually warps from tightening the six small screws. Remove and carefully flaten it but make sure you run a small drill bit through the IFR and main jet restriction to make sure they are open.
Do some reading in the archives for what other have done to address these problems.Comment
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Re: 3367 Holley Running Rich
i bought mine in packs of 50 from a local speed shop. i have not bought any for about 5 years as i have cut back on doing carbs. there are several carb rebuilder that sell parts on the internet give them a try and see if they have the brown or even black papers gaskets which are also the same type material as the brown ones.Comment
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Re: 3367 Holley Running Rich
I also had a the problem with running rich and the adjustment screws not having any effect. It turned out that someone before had installed the primary throttle plates upside down, and they would not close enough to sufficiently cover the transfer slots. Of course, when I rebuilt the carburetor, I was real careful to put them back in exactly as they were! I found the problem when I borrowed a known good carburetor and was checking it out before installation. I took them out,flipped them over, and all was good after I changed the fouled plugs. A good rule of thumb for setting the initial primary throttle position is to look from the bottom, the portion of the transfer slot exposed below the throttle plates should be a square, not a vertical rectangle. Probably not your problem, but Bubba seems to have been everywhere.
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