The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-21-2012, 02:46 PM   #1
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Which Holley carb?

Hey guys I was wondering if the Holey 80457s Carb would be a good choice for a stock 350 79 Chevy C10? If not this one what one would be better. The street avenger is a little more than Im wanting to pay. Thank in advance.
bgarr01 is offline   Reply With Quote
Old 05-21-2012, 07:37 PM   #2
raceman6135
Dino burner
 
raceman6135's Avatar
 
Join Date: Nov 2002
Location: Calgary, Alberta, Canada
Posts: 602
Re: Which Holley carb?

It will work, but it is a square bore carburetor, and your stock engine will have a spread bore intake manifold. This means that the Holley 80457 will not physically bolt onto your intake manifold. You will need to purchase an adapter plate to make it fit.

Also, since the fuel inlet is different, you will need to invest a few dollars into the fuel line in order to mate the carburetor to your existing fuel pump and line.

Might as well set aside a few bucks for jets and accelerator pump squirters as you may need to tweak those to get the best performance and fuel economy from that carburetor.

You can buy a remanufactured Quadrajet for your engine that will bolt right on and be adjusted properly right out of the box for less than what a Holley 80457 will cost.

Just some food for thought.
raceman6135 is offline   Reply With Quote
Old 05-21-2012, 08:52 PM   #3
S10Fan
Old Heap Driver
 
Join Date: Mar 2008
Location: Newport News, Va
Posts: 2,642
Re: Which Holley carb?

A properly tuned Quadrajet is a good carb. The Holley Street Avenger is an awesome carb, I have 2 on 2 different trucks and couldn't be happier.
__________________
_____________________________
Bryan

'99 Silverado 1500, 4.3, 5-speed, reg cab, short bed
'50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser.
'40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.
S10Fan is offline   Reply With Quote
Old 05-21-2012, 09:24 PM   #4
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

It currently has a Holley carb on it now model 8149-1. I've search a bit on the Internet and can't seem to find out about it. All the auto parts website says to go with the Holley 80451 but it's $350 vs the 80457 only being $250. The only real difference I notice is that the recommended one says it's street legal and will pass emissions. I live in Arkansas so I'm not to worried about emissions and what not. I guess I'm a bit confused.
Posted via Mobile Device
bgarr01 is offline   Reply With Quote
Old 05-21-2012, 09:26 PM   #5
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

I migh add as well that the current carb on it isn't doing its job. Anytime you apply more than quarter throttle it bogs down and occasionally backfires.
Posted via Mobile Device
bgarr01 is offline   Reply With Quote
Old 05-21-2012, 09:40 PM   #6
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
Re: Which Holley carb?

The street avenger would be the best choice but with that said the 80457 is a good carb thats been around forever and works well in stock-ish applications.


Now with that said theres probably no reason to replace your current carb. Most carburetor problems turn out to be timing issues. When is the last time you have done a tune up? Im talking cap,rotor,plugs and wires. Have you checked the timing? Can you better explain exactly what the truck is doing and when?
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 05-21-2012, 09:54 PM   #7
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

I recently bought the truck about a month ago. The previous owner said it sit in the field for 2 years. He told me he started it every now and then just to let it run. When I got it home, I did the tune up, plugs, wires, distributor rotor all that good stuff. I also emptied out the gas tank, it had a lot of gunk. At that point it would barely pull its self. I took it to a mechanic and he said he adjusted the timing and got most of it out. When you first start it, you cant give it more than quarter throttle without it bogging down with the occasional backfire. After it gets warmed up it seems to run much better. however it never really feels like it has any real power. Im new to all of this so I do appreciate all the help. SO far this site has been wonderful.
bgarr01 is offline   Reply With Quote
Old 05-21-2012, 10:01 PM   #8
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
Re: Which Holley carb?

The carburetor itself likely needs a good cleaning and a rebuild wouldnt hurt. A rebuild kit is 30 bucks versus a new carb at 250+. With an engine that sat for that long in a field. Its going to extremely hard to be sure of the condition and to ever get it fully back to tip top shape. I personally would start with the basics. Do a compression test first and make sure that the engine itself is in good shape. You could end up chasing a ghost by bolting new parts on to a worn out engine that wont ever run right without rebuild or replacement.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 05-22-2012, 05:43 PM   #9
raceman6135
Dino burner
 
raceman6135's Avatar
 
Join Date: Nov 2002
Location: Calgary, Alberta, Canada
Posts: 602
Re: Which Holley carb?

Quote:
Originally Posted by cableguy0 View Post
The carburetor itself likely needs a good cleaning and a rebuild wouldnt hurt. A rebuild kit is 30 bucks versus a new carb at 250+. With an engine that sat for that long in a field. Its going to extremely hard to be sure of the condition and to ever get it fully back to tip top shape. I personally would start with the basics. Do a compression test first and make sure that the engine itself is in good shape. You could end up chasing a ghost by bolting new parts on to a worn out engine that wont ever run right without rebuild or replacement.
Now that we know it's been sitting for so long, cable's suggestions are spot on.

The carburetor is likely gummed up and the gaskets have shrunk and are messing up the proper function of the carburetor.

Doing a compression check and leakdown test are also excellent ideas -- a new carburetor won't fix worn out valves, pistons and rings
raceman6135 is offline   Reply With Quote
Old 05-22-2012, 06:33 PM   #10
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

Took to the mechanic yesterday after the recommendations of having the compression checked. He said everything checks out and thinks that the carb either needs replaced or rebuilt. I had looked before for a rebuild kit, and came up empty handed and was just going to replace it resulting in the question I asked. I have since found a rebuild kit and have it on its way. So lets hope that fixes it. Hopefully I can rebuild it myself, looks pretty straight forward. Any suggestions or tips?
bgarr01 is offline   Reply With Quote
Old 05-22-2012, 07:40 PM   #11
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
Re: Which Holley carb?

Buy a bucket of berrymans chem dip carb cleaner. Leave the carb soak in it at least for 24 hours after you take it apart. After it soaks clean it off and blow compressed air through the passages in the carb. What were the numbers on the compression test?
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 05-22-2012, 07:55 PM   #12
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

Thanks for the tip. I'm not sure of the compression numbers. The mechanic just said the compression checked out alright.
Posted via Mobile Device
bgarr01 is offline   Reply With Quote
Old 05-23-2012, 06:46 AM   #13
i8tokyo
Registered User
 
Join Date: Aug 2010
Location: Olathe, KS
Posts: 61
Re: Which Holley carb?

The 0-8149-1 is a pretty small carb for even a stock 350. (450 CFM) The Street Avenger 0-80670 (670 CFM) would be the best way to go, sell the old carb to help make-up the difference. You should be able to get $50-75 for it off Craigslist, those are great carbs for a 6cyl.
__________________
1982 C-20, 454, TH-400, PS, A/C, 71,000 miles
1978 C-20, 350, TH-400, PS, Non-A/C, 112,000 miles

If it ain't broke, there is still probably room for improvement.

Speed costs money, how fast do you want to go?
i8tokyo is offline   Reply With Quote
Old 05-23-2012, 08:04 AM   #14
Hertzdaddy
Registered User
 
Join Date: Oct 2008
Location: Montpelier, VA
Posts: 315
Re: Which Holley carb?

Did your mechanic look at the distributor and check the timing? A backfire sounds like it could be a timing issue too.
Posted via Mobile Device
Hertzdaddy is offline   Reply With Quote
Old 05-23-2012, 10:59 AM   #15
bgarr01
Registered User
 
Join Date: Apr 2012
Location: arkansas
Posts: 35
Re: Which Holley carb?

Yeah he said he adjusted the timing. I think Im just gonna go with i*tokyos suggestion and get the 80670 street avenger and be done with it. If there's something else wrong with it, itll give me a good excuse for the wife that I need to upgrade.
bgarr01 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:26 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com