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

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  • Cars & Trucks Master
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Since this engine never came with this carburetor you will need to figure that out.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: how to hook up vacuum

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..

Posted on May 18, 2011

emissionwiz
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SOURCE: Need diagram for fuel and vacuum lines on Holley 80491 carb

Sorry we do not have this type of diagram

Posted on Sep 26, 2012

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83 Chevy s10 with carbureted 4.3l. Need to know where vac lines go. Truck runs great but dies when put into gear. Any ideas. Holley 4150 carb. There is 3 lines from tc. Ones a vent, other 2 idk where to...


one will go to the distributor vacuum advance unit- one probably goes to the vacuum actuator on the transmission one may go to a vacuum damper unit attached to the carby to slow down the throttle plate return

Jul 20, 2014 | Chevrolet S 10 Cars & Trucks

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I installed a holley 4 barrel carburetor in my 1983 buick regal , but it starts fine but won't idle ?


Check your vacuum hoses. Holley aftermarket may not have as many vacuum ports as OEM QuadraJets, and you may have a vacuum line that isn't plugged into anything...or you may have a vacuum leak around the carb base gasket. Also, does the Holley have an electric or manual choke? Is it connected?

Sep 29, 2013 | 1984 Buick Regal

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I have a 83 mustang gt 302 a Holley 600 it's


For those like me with a good old fashioned Holley type carb, here's a real nice video on the basics. He's gonna be doing more in-depth videos in the future. This cat flat out knows carbs!

Apr 17, 2013 | Cars & Trucks

1 Answer

Need diagram for fuel and vacuum lines on Holley 80491 carb


Sorry we do not have this type of diagram

Sep 26, 2012 | Cars & Trucks

1 Answer

Vacuum line diagram for chevy 350 engine with 4 bbl holley carb


where does the vacuum line from the transmission goes on thr carb on a chevy 350

Jan 09, 2012 | Cars & Trucks

2 Answers

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

Ok I have a holley four barrel 650 and i have it on the truck but it will run for a few minutes and then cut out. i think is a vaccum leak somewhere on thed carb but i need a schimatic to show me the which...


you are not going to find a vacuum diagram for a holley. the line on rt side of carb is ported vacuum for distibutor advance. and the lower bigger port is for pcv valve.

Mar 22, 2010 | 1985 Chevrolet S-10

2 Answers

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

3 Answers

I am installing a Holley 2818 on my '65 327 and need help with routing the PCV lines. Which line goes to the PCV inlet on the carb? The rear block inlet or the one on the oil filler neck?


On the 2818 holley there is a calibrated elbow on drivers side of carb about centre of the main body.This connects to oil filler stand pipe in front of intake.Fresh air hose goes from air cleaner to back of block where road draft tube used to be before PCV came along.
The calibrated elbow serves as PCV metered orifice.Be sure flame arrester screen is inside of air cleaner on fresh air connection.

George W.

Nov 02, 2009 | 1965 Chevrolet Corvette

1 Answer

I have a 1986 gmc 2500 van and my vacuum lines are crossed up and i need help uncrossing them


Carb vacuume lines? I can direct you to a holley website .... it has a diagram that has the q-jet vacuume routing all you have to do is look at the diagram then scroll down and look at the number to see where it goes.

http://www.holley.com/data/Products/Technical/199R9881.pdf

Hope this helps.

Jan 03, 2009 | 1983 Chevrolet Silverado

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