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Holley Carb advice please.
#688722 May 17th 2015 4:38 pm
Joined: Aug 2010
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Hi all

Just stripping down my holley 600cfm 1850-3 carb and need some advice as a bit confused:-

Needle valve and seat
In the pic below "Item No.58" is labelled up as a "Fuel Valve seat O ring seal". I cant see I have this fitted to the bottom of my needle valves see the pic of my float bowel.
If I were to slip an O ring at the bottom couldn't it just fall off - anyone know exactly where it goes? Do I fit it or does it come with it fitted?

[Linked Image]

[Linked Image]

Pipe positions on Carb
I have my carb plumbed in as follows, have I got the vacuum advance line on the right port or should it be on the lower one and the upper one then blocked off. I am thinking of getting rid of the vacuum gauge so want to confirm this is correct.

[Linked Image]

Manual Choke setup
The manual choke never seems to have worked, any ideas on how you set these up?
[Linked Image]



Last edited by Ram4ever; May 26th 2015 11:56 pm. Reason: broken link/underscoring
Re: Holley Carb advice please.
3pinplug #688730 May 17th 2015 6:15 pm
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That one caught me off guard as well. The pic is screwed up the o ring goes around the needle assembly, see the grove in the middle. The nipple on the metering block is ported vac.(Ford) I ran a tee on the vacuum advance for a gauge when tuning.

Re: Holley Carb advice please.
3pinplug #688731 May 17th 2015 6:26 pm
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Hi JCD74
Thanks for the info on the O ring I will relook at it tomorrow evening as 23.24pm here now.
So I had the vacuum advance on the right port, will look at blocking the other one off, good idea about the T piece will keep that in mind.
Regards
Mark

Re: Holley Carb advice please.
3pinplug #688733 May 17th 2015 7:31 pm
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When I rebuilt mine that pic had me stumped. Just to be clear the vac advance goes on base plate (bottom for chevy) I assume you have a Ford?

Re: Holley Carb advice please.
jcd74 #688773 May 18th 2015 4:51 pm
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hi JCD
I have a 318 mopar with edelbrock manifold with this fitted, it came fitted when I got the van. So for a Mopar where would I connect the vacuum pipe to the bottom or the side port?
Regards
Mark

Re: Holley Carb advice please.
3pinplug #688789 May 18th 2015 9:28 pm
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One of the Mopar guys need to chime in on this one, I don't speak Mopar. If your distributor has mechanical advance I would run it like the chevy's. If it belongs there you will see a big improvement across the board. I have ran my chevy set up like that (ported) and switched. I had to do my own research to find out. I could not get a solid answer from my friends which was correct, they all had different answers for what worked best for them.

Re: Holley Carb advice please.
3pinplug #688798 May 18th 2015 10:57 pm
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The carb should be easy to figure out here is a linky to some forums.

holley forums

There is also tech sheets such as this.

1850 tech sheet

Holley is one of the better customer service businesses in my opinion.The 1850-3 translates into a 1850c of some sorts I think . I hope this helps,Holley can be a pain to get to know,but it does payoff.IMHO I always print the tech sheets as soon as possible it just feels better when its dirty,okay that did not come out the way it was intended ,either way I stand behind it.

Last edited by Hoagie; May 18th 2015 11:02 pm. Reason: for Sh*ts andG!ggles
Re: Holley Carb advice please.
3pinplug #688945 May 22nd 2015 5:21 pm
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According to research vac advance in top pcv at bottom, vac gauge or plug in other bottom port.

Anyone know why the top of the carb is so black:-

1. Could it be air filter leaking and drawing in dirt etc?
2. Dodgey PCV valve?
3. Choke not set right - its a manual choke and I have never really had it work correctly again came fitted from previous owner?

Hope someone can advise

Thanks

Mark

Re: Holley Carb advice please.
3pinplug #689221 May 26th 2015 11:52 pm
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When I see black in a carb, I immediately think backfiring... more typically that's an issue with timing/distributor adjustment or wear/timing chain wear.

Crankcase vapors should be drawn downwards into the manifold rather than going the opposite direction.

If the PCV valve or its hose or the nipple into the base of the carb were completely obstructed, the crankcase vapors could blow back through the crankcase inlet oil bath air cleaner, then into the main air cleaner and into the carb. There would be a pretty obvious oily staining around the crankcase inlet air filter hose at the main air cleaner nipple if that were the case. If the crankcase inlet air cleaner hose is dry and non-oily inside, the vapors aren't following that path.

I'm not familiar with that carb, so I don't know the choke adjustment specific to it, but if it's actually a manual choke, the actuating linkage/cable should probably get you from completely closed to completely open as you draw on it; on any normal carb the choke plate should be wide open during normal warmed up operation. You'd close it for starting, then draw it out slightly during warmup.

BTW, in your original post the underscoring and photobucket link for your last picture had gotten tangled up, so I fixed it for you. smile


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