What is this hole? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Nima** · 10-05-2004, 01:02 AM

I am confused here. I am trying to study this edlebrock carb before jumping into instalation. On the other side of carb, I have 3 holes for vaccume and pcv valve connection. On the side I hace the fuel inlet. Then what is this hole? Am I making any mistake about other holes? Any input is greatly appreciated. THANKS

**Nima** · 10-05-2004, 01:04 AM

Sorry, I don't know how to mark it.Beside mechanic I am computer idiot too. My concern is the hole in the middle!. This question sound funny?ha.
Thanks

Fred T · 10-05-2004, 01:14 AM

Go to http://www.edelbrock.com/tech/index.html
and click Get Instant Answers
Then Show me products that are non-vehicle specific
Then click Carburetor and on the next page click Carburetor.
Next is a page where you find your specific carb and will take you to a page for your carb. Then click on Installation Instructions, a PDF page will open with complete instructions and pictures telling you what is what.

chevy69er · 10-05-2004, 01:28 AM

The hole in the back of the carb.?If so that is a vacuum for power brakes.

**Nima** · 10-05-2004, 01:56 AM

Yes, the big one on the back. If this is brake vaccume, on my current carb the vaccume line comes out off the intake and then split and goes to brake booster and carb. Is it gona be the same? because it looks very big big. I guess I need to use some adaptor?
By the way, I have not called edlebrock yet, but on their website, I couldn't find any info regarding this hole.
Thanks for the answers.

67ChevyC10Stepside · 10-05-2004, 02:00 AM

the normal way to do it is plug the intake....and get a line with a one way valve from the booster to the back in that port.

Blazer1970 · 10-05-2004, 06:41 AM

If your brake booster vacuum is already hooked to the intake, just get a pipe plug and plug that hole in the carb.

**Nima** · 10-05-2004, 03:50 PM

This is my current setting:
The red cross which is coming out of brake, goes to intake and from there it connects to carb. Is this the one which is suppose to go to the big hole on the back of edlebrock? Does it suppose to connect directly or it needs to go to intake again?
The other green cross which is coming from valve cover connect to the carb directly.

**john** · 10-05-2004, 04:39 PM

Quote:

Originally Posted by Blazer1970

If your brake booster vacuum is already hooked to the intake, just get a pipe plug and plug that hole in the carb.

I agree, Either port is good. John

dwaite72lnghrn · 10-05-2004, 04:55 PM

The green Hose PCV goes to the front bottom middle of the Edelbrock. The brake booster hose normally goes to the rear bottom middle of carb. You going for a new intake also? It looks like you have a 2bbl now and the edelbrock is a 4bbl. The tap on the intake could go to the transmission if Automatic and the vacuum canister for the heater controls otherwise plug it. If you go with a stock cast iron intake you will need a adapter base, if you go with a edelbrock intake you don't really need it but some folks use them anyway.

**Nima** · 10-05-2004, 11:18 PM

I am changing the intake too, to edlebrock performer series. therefore this is my undrestanding, correct me if I am wrong: I connect the brake booster line directly to rear carb hole (my original hole confusion) and will cap the hole on tha intake.
By the way, I have manual transmission.

dwaite72lnghrn · 10-06-2004, 05:41 AM

That sounds about right. You don't currently have any vacuum canister for vents or anything then plug the intake. Try and get a brass or stainless plugs and bolts, If you use plain steel they rust and discolor the intake. You will need a heater hose adapter, and a large plug (unless you have aftermarket temp sensor), a stainless bolt for the throttle return spring, a new aluminum distributor hold down and bolt, a new chrome neck for radiator, stainless manifold bolts, and gasket set to match the manifold (throw away the thick rubber front and rear seals use black RTV, you will never get it to seal if you use the rubber ones), new vacuum hose to the distributor.

New fuel line, steel fuel filter before the carb, new air filter housing.

Longhorn Man · 10-06-2004, 05:57 AM

You might want to install new valve covers too so you'll have an oil fill location...you could dump through the PCV or the vent hole, but a larger hole is nice.

**Nima** · 10-06-2004, 10:55 AM

Thanks guys. Very good info for somebody like me. About the vave cover, I was thinking to change those but I was afraid to add to my confusion because the one I saw, they have on hole on each valve cover but the one I have, the one on the R side of the engine, has two holes. If you can give me insight, I will change those too.
Guys, I have to say it again, thanks for info.

A.P. · 10-06-2004, 11:32 AM

Here is a pic of my Q-jet with the vacuum connection on the back. I will replacing the Q-jet with an edelbrock 1406 carb.

Tx Firefighter · 10-06-2004, 11:44 AM

Here's how I did the line off of my Edelbrock carb when I converted to power brakes.

It's a section of steel fuel line that I bent to fit. Notice, I put a bulge on the end of the steel line to give the rubber hose some bite, or resistance to coming off as easily.

By the way, that's an Edelbrock Performer intake too, it's just painted to blend in with it's surroundings better.

**Nima** · 10-06-2004, 03:13 PM

Thanks guys. I believe after all other explanations, the pictures nailed it to my brain, I hope so!!. I'll try to start the project this weekend. I'll let you guys know. Meanwhile any other hint(s) specially about valve covers would be appreciated. Thanks again.

10-05-2004, 01:02 AM	#1
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	What is this hole? I am confused here. I am trying to study this edlebrock carb before jumping into instalation. On the other side of carb, I have 3 holes for vaccume and pcv valve connection. On the side I hace the fuel inlet. Then what is this hole? Am I making any mistake about other holes? Any input is greatly appreciated. THANKS Attached Images

10-05-2004, 01:14 AM	#3
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Go to http://www.edelbrock.com/tech/index.html and click Get Instant Answers Then Show me products that are non-vehicle specific Then click Carburetor and on the next page click Carburetor. Next is a page where you find your specific carb and will take you to a page for your carb. Then click on Installation Instructions, a PDF page will open with complete instructions and pictures telling you what is what. __________________ Fred There is no such thing as too much cam...just not enough engine.

10-05-2004, 01:28 AM	#4
chevy69er Registered User Join Date: Feb 2003 Location: Lakewood,Ca Posts: 69	The hole in the back of the carb.?If so that is a vacuum for power brakes. __________________ 1969 C-20,383 stroker,sm465,custom long travel front suspension,4 wheel disc brakes,35" pro comps...mods under way include: 4x4 conversion,and custom bumpers.future mods include: gear vendors od unit,and relocation of fuel cell.

10-05-2004, 02:00 AM	#6
67ChevyC10Stepside Registered User Join Date: Mar 2004 Location: Butler PA Posts: 3,034	the normal way to do it is plug the intake....and get a line with a one way valve from the booster to the back in that port. __________________ 67 c-10, 400 SB, TH350, 4.10 gears, Blazer tank,camaro tach, sidemarker fuel fill (soon) WTB: stepside parts, 67 front end parts, 67 small window cab. posi for 3.73 or 4.10 for 12 bolt and 10 bolt.

10-05-2004, 06:41 AM	#7
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	If your brake booster vacuum is already hooked to the intake, just get a pipe plug and plug that hole in the carb. __________________ Tim

10-05-2004, 01:04 AM	#2
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	Sorry, I don't know how to mark it.Beside mechanic I am computer idiot too. My concern is the hole in the middle!. This question sound funny?ha. Thanks

10-05-2004, 01:56 AM	#5
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	Yes, the big one on the back. If this is brake vaccume, on my current carb the vaccume line comes out off the intake and then split and goes to brake booster and carb. Is it gona be the same? because it looks very big big. I guess I need to use some adaptor? By the way, I have not called edlebrock yet, but on their website, I couldn't find any info regarding this hole. Thanks for the answers.

10-05-2004, 03:50 PM	#8
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	This is my current setting: The red cross which is coming out of brake, goes to intake and from there it connects to carb. Is this the one which is suppose to go to the big hole on the back of edlebrock? Does it suppose to connect directly or it needs to go to intake again? The other green cross which is coming from valve cover connect to the carb directly. Attached Images Last edited by Nima; 10-05-2004 at 04:47 PM.

10-05-2004, 04:55 PM	#10
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	The green Hose PCV goes to the front bottom middle of the Edelbrock. The brake booster hose normally goes to the rear bottom middle of carb. You going for a new intake also? It looks like you have a 2bbl now and the edelbrock is a 4bbl. The tap on the intake could go to the transmission if Automatic and the vacuum canister for the heater controls otherwise plug it. If you go with a stock cast iron intake you will need a adapter base, if you go with a edelbrock intake you don't really need it but some folks use them anyway. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

10-05-2004, 11:18 PM	#11
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	I am changing the intake too, to edlebrock performer series. therefore this is my undrestanding, correct me if I am wrong: I connect the brake booster line directly to rear carb hole (my original hole confusion) and will cap the hole on tha intake. By the way, I have manual transmission.

10-06-2004, 05:41 AM	#12
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	That sounds about right. You don't currently have any vacuum canister for vents or anything then plug the intake. Try and get a brass or stainless plugs and bolts, If you use plain steel they rust and discolor the intake. You will need a heater hose adapter, and a large plug (unless you have aftermarket temp sensor), a stainless bolt for the throttle return spring, a new aluminum distributor hold down and bolt, a new chrome neck for radiator, stainless manifold bolts, and gasket set to match the manifold (throw away the thick rubber front and rear seals use black RTV, you will never get it to seal if you use the rubber ones), new vacuum hose to the distributor. New fuel line, steel fuel filter before the carb, new air filter housing. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne Last edited by dwaite72lnghrn; 10-06-2004 at 05:47 AM.

10-06-2004, 05:57 AM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	You might want to install new valve covers too so you'll have an oil fill location...you could dump through the PCV or the vent hole, but a larger hole is nice.

10-06-2004, 10:55 AM	#14
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	Thanks guys. Very good info for somebody like me. About the vave cover, I was thinking to change those but I was afraid to add to my confusion because the one I saw, they have on hole on each valve cover but the one I have, the one on the R side of the engine, has two holes. If you can give me insight, I will change those too. Guys, I have to say it again, thanks for info.

10-06-2004, 11:32 AM	#15
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Here is a pic of my Q-jet with the vacuum connection on the back. I will replacing the Q-jet with an edelbrock 1406 carb. Attached Images

10-06-2004, 11:44 AM	#16
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Here's how I did the line off of my Edelbrock carb when I converted to power brakes. It's a section of steel fuel line that I bent to fit. Notice, I put a bulge on the end of the steel line to give the rubber hose some bite, or resistance to coming off as easily. By the way, that's an Edelbrock Performer intake too, it's just painted to blend in with it's surroundings better. Attached Images __________________ I'm on the Instagram- @Gearhead_Kevin



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10-06-2004, 03:13 PM	#17
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,178	Thanks guys. I believe after all other explanations, the pictures nailed it to my brain, I hope so!!. I'll try to start the project this weekend. I'll let you guys know. Meanwhile any other hint(s) specially about valve covers would be appreciated. Thanks again.

Register or Log In To remove these advertisements.