I have Holley carb #0 80457S Model 4160 Street Performance 600 Cfm Square Flange 4 Barrel Vacuum Secondary Electric Choke, and it's giving me issues. The secondary discharge nozzle /booster veturi's are dripping gas, even after i turn off the car. I'm not sure what the problem is, but i only had it for a month. My car is burning rich, and does react to the gas mixture screw. Can anyone give me some advice on how to fix this problem?
Holley carb issues
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It sounds to me like the float level is set too high. On older Holleys, there is a screw on top of the bowl that adjusts the height, and a sight plug to tell you if it is too high. I don't know about the newer ones though, as I have heard they changed it. I have had this issue on every Holley I ever had, and it is part of the reason I despise these carbs so much. I have never had one work well.
definitely too high float level .....
loosen up the screw on top of the needle&seat .....turn the nut 1/2 turn clockwise to start, retighten the screw .....run engine for 5 minutes ...stop engine ....remove side bowl pug to see fuel level (it has to be flush or slightly below with bottom of hole ).....if not ,adjust acordingly .
dont forget the fuel burns on hot surfaces !
Dan
loosen up the screw on top of the needle&seat .....turn the nut 1/2 turn clockwise to start, retighten the screw .....run engine for 5 minutes ...stop engine ....remove side bowl pug to see fuel level (it has to be flush or slightly below with bottom of hole ).....if not ,adjust acordingly .
dont forget the fuel burns on hot surfaces !
Dan
Ok, so I’m a lil ashamed to say this. But at this point, I just want to pay someone to take care of my carb problem, being that this car is my daily driver. I called up a carb shop yesterday, and I spoke to one of the guys there. He sounded like he knew what he was talking about as I asked him questions. He did suggest that I pinch the fuel line and let the car die, and might clear up the dripping. So I did this morning, and the dripping stopped until I released the hose. I also notice that the idle straighten out. Could it be that I’m getting to much pressure from my fuel pump? It just doesn't make any sense, because the fuel pump that I’m using was from my old 305. I mean the fuel pump isn't that old, I replaced it 3 month after getting my car back in august. The fuel pump that came with my crate engine, had a clearing issue. It would fit do to the frame, so I used the one I bought for my old tired 305. What do you guys think?
As long as its a mechanical stock fuel pump it should not cause any problems. All carbs run at very low pressure no matter what, so it most likely is not your problem.
to me your test confirms a float issue. by pinching the line you've limited the amount of fuel to the engine, same as lowering the floats. definately lower the floats, even if you have to pull the bowls. it's real easy just be careful with the gaskets if you don't have new ones standing by.
My humble opinion would be to replace that carb with a good GM/Rochester one that will keep its settings and stay in tune, and give good gas mileage. I've taken apart a lot of carburetors from Holley, Motorcraft, Carter, Solex, Mikuni, Keihin, etc, and there is just little that compares to the quality of a Rochester carb. I don't detest Holley so to say, they are a good carb for the drag strip, something that excels when it comes to getting a lot of air and fuel in to an engine quickly. But for the street/daily driver (in other words a carb you use in all sorts of conditions) you aren't going to beat an OEM Rochester on a GM engine. It's just going to save you a lot of money and spare you a lot of aggravation down the road.
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-UT-
I tend to agree. Holley carbs are trouble. I have had more aggravation with them than any other carb. Why they are so popular, I have no idea. For a universal carb, Edelbrock's copy of the Carter AFB is a much better design. However, my first choice will always be a Rochester Quadrajet that is functioning properly. The best fuel economy, throttle response, and it's set and forget. Once it is tuned right, you don't have to keep tinkering with it to keep it in tune. Plus, the TV cable fits as does the A/C solenoid, etc. You can adjust the CFM with a screwdriver and an allen wrench in less than a minute too.
if you have absolutely no mechanical skills ., ask a mechanic to do what
i wrote !
end of problem.....for now! ;-)
Dan
i wrote !
end of problem.....for now! ;-)
Dan
so I turn the nut 1/2 turn clockwise to start, retighten the screw .....run engine for 5 minutes and what do you know. No more leaking. Thanx DAN!!!!! it sure did the trick... When I get the chance, I want to take out the side bowls and clean them up.
In search of more power, I did some research and found this article on Car Craft Magazine ( http://www.carcraft.com/projectbuild/11 ... index.html ), and they added Hedman headers, an Edelbrock Performer RPM Air Gap dual-plane intake, and a 750-cfm Holley double-pumper carburetor. The simple bolt-on changed the 350 up from its stock power rating of 330 hp and 380 lb-ft of torque to a 377 hp and 415 lb-ft of torque.
My concerned would be using the Holley carburetor again. Would it be possible to get a Rochester Quadrajet and have it push out 750-cfm? Does anyone know of reputable place to get one from? Or could I pick up one at a junk yard, and have it work on?
Another concern that I have would be that I currently have some flowtech headers on, would I have to switch over to the Hedman’s to get these results?
In search of more power, I did some research and found this article on Car Craft Magazine ( http://www.carcraft.com/projectbuild/11 ... index.html ), and they added Hedman headers, an Edelbrock Performer RPM Air Gap dual-plane intake, and a 750-cfm Holley double-pumper carburetor. The simple bolt-on changed the 350 up from its stock power rating of 330 hp and 380 lb-ft of torque to a 377 hp and 415 lb-ft of torque.
My concerned would be using the Holley carburetor again. Would it be possible to get a Rochester Quadrajet and have it push out 750-cfm? Does anyone know of reputable place to get one from? Or could I pick up one at a junk yard, and have it work on?
Another concern that I have would be that I currently have some flowtech headers on, would I have to switch over to the Hedman’s to get these results?
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