Holly 600 Carb Question(s)

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Can I do this for off-road and cut vent lines in the top of the hose?


Is this port for the vacuum advance for the distributor?

[AMX69PHATTY]

Vac Port for Vac Advance - Yes

Anti-Slosh Rubber Hose - Yes, would link it'd be ok.
See guys with it like that at the drag strip.
Cut a notch out of the center of the hose of course.

[fuzz401]

yes on both like said

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Thank you,

Jim

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1. Also, do I have to run a fuel pressure regulator or does the fuel pump I bought from Advanced Auto 6505 run @ 6psi?



2. Without braking the bank can you suggest a regulator that works well?

3. Also, if it is a variable regulator, how do you know what your demand is or do you just set it @ 6psi per the mfg recommendations?

Thanks from a I-6 guy.

[AMX69PHATTY]

Understanding is the 6505 is a 6-7 psi pump and should work ok without a regulator. It's a stock type replacement, and a regulator was not used in the stock set up.

Stock set-up would be fine for the Jeep I would think.
Fuel requirements are determined by peak HP. From that there are charts for pounds per hour of fuel requirements. From that fuel psi and carb needle and seat orifice size is determined. For big HP, pumps with excess capapcity are needed to insure there is no chance of pressure drop at hi-rpm high fuel demand circumstances, so a regulator is in the system to limit max fuel pressure at low rpm and idle speed when an excess capacity fuel pump is used, at least as I understand it. Use the good ol' Holley Regulator, QuickFuel offers them now also, maybe $30 or so. An inline fuel press gauge is needed so the Regulator can be adjusted to set the pressure. Edelbrock offers a Holley Dual Line Kit Jegs #350-8192 for ~$100 I like since it centrally locates the Regulator and prevents interference with the Stock AMC Coil mounting location. The Edelbrock Regulator Mtg plate in the kit positions the regulator up to high though and can cause interference with the Air Cleaner Assembly, so a custom Regulator mounting bracket was designed and fabricated. Pic of set-up on an AMX.
Set-up on the Jeep should work, just will have to relocate the coil.

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Thank you so much. I will run it and see.

1. Also, on this type carb I see float adjustments but no glass, so, how do you tell the correct float adjustment? Don't have a book on the carb.

2. The carb has been sitting and a rebuild @ this time is out of the question (was run dry). Do you have something I can run through it or ....

Thanks,
Jim

[AMX69PHATTY]

Brass sight screws on the passenger side of the fuel bowls.
Front one is just forward of where the dizzy vac hose attaches.
With screws removed, fuel should come up to just below the holes when running and not run out.
On top center of each bowl, level is adjusted by holding the hex and cracking loose the screw.
Screw is the "locking mechanism", once screw is loose, the needle body itself is threaded
and is adjusted in and out of the bowl by turning the hex.
It may be difficult to get the screw and hex to seal back up after making adjustments.
There's a gasket between hex and bowl, another between screw and hex.
They get hard and can stick and tear when making adjustments after sitting.
Might leave'em be until it is started and running.
Or maybe hit'em with a little wd-40 and let soak first.

Then remove the (2) brass sight screws from the sides of the bowls.
Sight Screws have black teflon coated steel washers behind them.
They usually stick to the bowl, sometimes can just leave'em there, then put sight screws back.
Hopefully with it running, fuel will not run out with screws removed.
I've gotten to where I set Holley float levels on the bench when bowls are off, and leave'em alone.
But if fuel is running out of the sight screw holes with engine running, the floats should be lowered, imho.

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Thank you very much for all your help.

[AMX69PHATTY]

Gas will ooze or spray out from around the needle screw and hex when making adjustments. Glad to help.