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NCC Forum Home Page -> NCC - General Discussion -> How do you tell the front fuel bowl spring from the rear fuel bowl spring on a Holly 4160?
Post Info TOPIC: How do you tell the front fuel bowl spring from the rear fuel bowl spring on a Holly 4160?
jim larson


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How do you tell the front fuel bowl spring from the rear fuel bowl spring on a Holly 4160?
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I disassembled the fuel bowls not noting the difference; but have since read there is a difference.  Is there a way to tell which is which?  Two different part numbers in the catalog, so they must be different.

Another question: my schematic shows a weight and check ball below the squirter needle valve.  I didn't notice these when I took the squirter and needle out; but I have been noted to lose things.  Is there suppose to something like that in there?  Thanks, Jim



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Jim L

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jim larson


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It appears that one has 7 coils and the other has 9 coils.


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Jim L

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John D


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Dug through some of my old Holley stuff...

Front Spring is P/N B3615, Rear Spring is P/N B3604... but that doesn't really help you. From the exploded diagrams I have it shows a taller & larger dia. spring in the front bowl.

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John D. - St. Louis Park, MN.

1965 El Camino - LT-1, 4L60e, 4wh discs, SC&C susp.
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jim larson


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Thanks John, those are the part numbers I also got.  Holley only makes and sells one spring. Holley says it doesn't make any difference.  But I found someone in CA that sells both.  BPT Performance  carburetors.



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Jim L

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John D


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My recollection of the accelerator pump area was there is a check-ball in the fuel bowl housing, but it wasn't something that could be lost... it was staked in place with a metal strip...(?)

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John D. - St. Louis Park, MN.

1965 El Camino - LT-1, 4L60e, 4wh discs, SC&C susp.
2013 F-150 Platinum - Twin Turbo 3.5

2018 Factory Five MkIV Roadster build thread
Lost in the 60s


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I had the squirter nozzle off 2 Holley's recently and the check ball and weight didn't fall out, even when I shook them upside down. Look down the bore. If you see the square weight, it's all still in there.

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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

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jim larson


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I think I don't know for sure what I am looking for.  I took the   squirter off another carb, the needle valve fell out but nothing else.  When I look down the the hole of both carbs I don't see anything except a little hole that the needle valve  looks like it fits into.

 

John, yes on the bottom of the front fuel bowl where you mount the accelerator pump there is a little metal clip that hold the check ball in place.



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Jim L

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Bobs_Place


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There should be a check valve of some kind. Some use a valve that is just sort of 1/2in long, 5/32 dia. and pointed on one end.
And like Mitch states, a check ball and weight. Both should be free to drop out if you turn the carb over after removing the nozzle.
I have had them stick from sitting and the fuel drying up. If your is gone, get the list # from the air horn of the carb and we should be able
to find the correct valve on the Holley web site.

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Bob W.

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jim larson


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Bobs_Place wrote:

There should be a check valve of some kind. Some use a valve that is just sort of 1/2in long, 5/32 dia. and pointed on one end.
And like Mitch states, a check ball and weight. Both should be free to drop out if you turn the carb over after removing the nozzle.
I have had them stick from sitting and the fuel drying up. If your is gone, get the list # from the air horn of the carb and we should be able
to find the correct valve on the Holley web site.

 Thanks Bob, both of mine have what you describe as a cylindrical valve about 1/2" long with a pointed tip on one end.  This is what the schematic shows; but it also shows a weight and a check ball with no part #.  The schematic shows the piece I have with a part #B3318.  Maybe you use one option or the other, the check ball and weight or the valve.



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Jim L

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jim larson wrote:
Bobs_Place wrote:

There should be a check valve of some kind. Some use a valve that is just sort of 1/2in long, 5/32 dia. and pointed on one end.
And like Mitch states, a check ball and weight. Both should be free to drop out if you turn the carb over after removing the nozzle.
I have had them stick from sitting and the fuel drying up. If your is gone, get the list # from the air horn of the carb and we should be able
to find the correct valve on the Holley web site.

 Thanks Bob, both of mine have what you describe as a cylindrical valve about 1/2" long with a pointed tip on one end.  This is what the schematic shows; but it also shows a weight and a check ball with no part #.  The schematic shows the piece I have with a part #B3318.  Maybe you use one option or the other, the check ball and weight or the valve.

 That sounds right as the ball is much lighter than the needle valve, hence the weight to get it to drop quickly after the surge of gas.



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
Bobs_Place


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Don`t worry about the ball and weight if you have the 1/2" valve, I think the ball and weight is for older carbs, and possibly replaced with the valve in the carb kits.
All the carbs I checked have the 1/2 pointed valve. Mitch is right, the valve needs to stop the nozzle from siphoning fuel after the throttle stops opening, when the throttle
is closed the valve stop fuel from being pulled back, the pump is then ready and full of fuel for the next time the accelerator is depressed.

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Bob W.

Lino Lakes
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