Question about 1968 Ford Mustang 4.7

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Diagram holley 80457

Secondaries drip gas at idle

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Check the float level; in the secondaries and adjust as necessary . check for gunk under the needle and seat.

Posted on Apr 13, 2014


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My 302 is bored 30 over voodoo cam adv dur is 284/292 lift is560/582 msd ign air gap intake holley 780 the motor wont go past 4500 rpm

Hey Darin...have a look down the carb, while the engine is not running and check to see if your butterflys are fully opening under wide open throttle.

Sometimes if adapter plates are used they hang up the secondaries.

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350 holley diagram

Check for vacuum leaks--pipe to base of carby for distributor---vacuum brake hose. Check float levels check power valve diaphragm is not burnt or has a hole. Check the gasket at the base of the carby Screw both idle mixture right in then back each 2and 1/2 turns . Use the throttle until you can get the engine to run and reduce throttle until it idles on the jets.. Check engine timing and correct firing order.

Apr 28, 2013 | Cars & Trucks

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Where to hook up vacuum lines on holley 600 80457-3 for a olds 403

Since this engine never came with this carburetor you will need to figure that out.

Nov 05, 2012 | Cars & Trucks

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How to hook up vacuum lines for holley 600 cfm

When attaching vacuum lines, you need to remember only one thing. Mark each hose when you remove it from the original carb (quadrajet?) Hoses that attach to the baseplate are at full vacuum and should be returned to a similar location or to the manifold, using a "tree". Hoses that are connected to the body of the original carb only see vacuum when the throttle is opened. Those can be attached to the fitting on the right side of the front metering block. Most Holley carbs have no provision for the valve located at the front of early Q jets (bowl purge) nor do they have any electrical connections except for the choke mechanism.
The most important vaccuum line is the one for your power brakes. Make sure that one is firmly connected either to the rear of the carb baseplate or the manifold. All other lines are nowhere as critical as that one is..

May 18, 2011 | Chevrolet Chevette Cars & Trucks

1 Answer

My 89 f250 has no power it wont even spin the tires how do i get more power?

If it is a 6.9 Diesel you won't. If its a gas engine you can try to set the timing, do a tune up, and invest in a K&N airfilter.

If you have the plugs out, check the compression and see what you have to work with before spending a lot of money. If this model still has a carburetor and its a Holley, you can try a richer power valve. If it has Vacuum secondaries Holley makes different springs to open them sooner.

You probably have room under the hood, so see if you can get a spacer for the base of the carburetor. It will improve flow and horsepower.

Mar 31, 2010 | 1989 Ford F 250

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I need to adjust a carberater and get the 4 barrel to start working

Most likely you have a Holley carb. You may have a 460 engine. If you have the carb with a big vacuum pot in front of the carb, then you have a RPM governor. The RPM governor will work against the 4 barrel.

The main mixture for the idle jets can be adjusted like any old style carb. You may have plastic caps over the idle screws but take them off. Then use a vacuum gauge on any intake fitting and proceed to read the vacuum level as you turn the mixture screws. You want the mixture to reach a maximum RPM, then evenly turn the screw in until the RPM drops slighty and then balance for smoothest idle.

After this step adjust curb idle and see if this helps when the 4 barrel kicks in. Holley has different springs for the vacuum actuated secondaries and they are color coded. If the carb is original it should be right, but if the carb is of unknown origin you can check the proper vacuum spring, main jet, power valve and so on in a good Holley book. The mechanical secondaries are also listed with clearances to hand adjust.

By adjusting the mixture screws you have set the engine to idle just below peak vacuum pressure. This means you should have more vacuum to work the secondaries.

Feb 16, 2010 | 1983 Ford F 350

2 Answers

I have a pontiac 389 with an edelbrok performer manifold and 750 edelbrok carb. wondering if this is a good set up and how can I fine tune it. it boggs down when I go wide open on the throttle, it feels...

I would recommend replacing the carb with a double pump holley performer series, I have had bad luck with the edelbrock performance, and their is always a lag when the secondaries open due to no accelerator pump on the secondaries.

Feb 16, 2010 | 1978 Pontiac Bonneville

1 Answer

My holley 600 is leaving petrol in manifold only when car is at operating normal temp , when you turn car off you can see petrol still dripping into bowl ,eg secondries

maybe the needle and seat is bad/worn out. It could be letting gas pass through. A rebuild kit is fairly inexpensive. (20-30 dollars)

Jan 02, 2010 | 1983 Ford Fairmont

1 Answer

What kind of holley carburetor do i have is is all the numbers i find with out taking off the carburetor here the numbers 80457-71927 2 1761 p80 r11520-2e

Hi There
I have found this site for you so you can see by pics.hope this helps and let me know.
Thank you for writing to fix ya.
Best Regards Richard

Dec 29, 2009 | 1978 Chevrolet C1500

1 Answer

86 ford f250 4x4 will not stay idling

yes the vacum lins are suspect chechk the vacum advance line, refer to the vacume diagram that holley supplies with the new cab kit.

Dec 17, 2009 | 1995 Ford F250

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