Holley carb issue - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 27th, 15, 05:34 PM Thread Starter
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Holley carb issue

So, I have a 4160 carb that had side hung float bowls. I switched to center hung bowls I had laying around from an old vac sec 4150. It all seemed to go together fine but the secondaries flood out as soon as it starts running. I know what the problem is. The brass float in the secondary bowl is hitting the metering plate because it is made for a 4150 that has a metering block. The cure is to get the nitrophyl secondary float as it is designed to not hit the metering plate. Its what comes stock in all 4160 center hung secondary bowls. My problem is which float to get. Im thinking its this one.

https://www.holley.com/products/fuel...ts/parts/116-3

I cant seem to find any info on the holley site pertaining to this. Does anyone know if this is the right float for my needs?
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post #2 of 8 (permalink) Old Apr 27th, 15, 07:39 PM
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Re: Holley carb issue

May not be the right one.
But, you could take a metering plate and have the inside machined out and use the outside as a bowl extension.
This would make the 4160 look like a 4150 carb.

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post #3 of 8 (permalink) Old Apr 27th, 15, 07:58 PM
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Re: Holley carb issue

Why not just turn it into a true 4150 using this metering block?

https://www.holley.com/products/fuel...v1iRoCLwPw_wcB

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post #4 of 8 (permalink) Old Apr 27th, 15, 09:59 PM Thread Starter
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Re: Holley carb issue

I actually do have a couple of 600 cfm 4150 metering blocks. Both from gm 327 corvette carbs. One has a broken baseplate so its just really parts. I also have the block from the 780 that I got the bowls from. Will that block work? It has a power valve. I hate to mess with this carb too much. It was kinda new and shiney with good secondary shaft bushings, something I have been unable to find in a used holley carb. I just wanted the look of the center hung bowls. I think its the correct float as the arm seems a bit shorter than the brass one. I ordered it, it was cheap. If it works, great, if not, Ill think about the metering block switch.
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post #5 of 8 (permalink) Old Apr 28th, 15, 08:51 AM
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Re: Holley carb issue

My orig 4150 float. New ones went to plastic.


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post #6 of 8 (permalink) Old Apr 28th, 15, 09:17 AM
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Re: Holley carb issue

Brass is the best float to have. The new plastic floats are alcohol proof, but older ones were not.

If you are going to use a metering plate off of a donor carb it HAS TO BE THE SAME SIZE. The metering block measures the fuel to the air ratio based upon the air flow (cfm). It also has emulsion tubes based upon the booster type and orientation (straight, or down leg; or in high performance carbs annular). These metering blocks can be drilled or plugged with wire, or epoxy, in general they can be modified in a number of ways to work, but in every case it will require an air fuel meter to tune it and make it work in mid range as well as WOT.


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post #7 of 8 (permalink) Old Apr 28th, 15, 09:32 PM Thread Starter
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Re: Holley carb issue

COPO, thats the exact same float that was in the bowl I used. It works fine for a 4150 but will hit the plate if used on a 4160. I could bend it or dent it in to try and make it work but a new one is cheap, to do it right. Dave, I was hoping not to have to add the block as it ran so good before the new bowls. So, the 780 block is a no go. Good to know.
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post #8 of 8 (permalink) Old Apr 29th, 15, 01:36 PM Thread Starter
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Re: Holley carb issue

Well, the new float came in the mail today. Installed it and I could see that it sat farther in the bowl. Installed everything and its running lke a champ now. So, part # 116-3 is the correct float for a center hung 4160 secondary.
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