Holley Carbs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ClassicRedneck05 · 02-03-2007, 06:08 PM

was wondering if this would be a good carb for my truck its a 1972 Chevrolet C-10 with a 350 and TH350 transmission stock stock motor except added headers i do have an intake or it as well now.. here is the link and its part #510-O-80770

http://www.jegs.com/webapp/wcs/store...49689_-1_10271

Paul72 · 02-03-2007, 06:32 PM

It would work, but with a stock motor, it may be an unwise use of $$. A regular Holley with vacuum secondaries, either 600 or 650CFM would work just as good IMO. The avengers tend to cater to the 'built' motors that flow better than stock.

Paul

FarmTruk · 02-03-2007, 06:58 PM

Quote:

Originally Posted by Paul72

It would work, but with a stock motor, it may be an unwise use of $$. A regular Holley with vacuum secondaries, either 600 or 650CFM would work just as good IMO. The avengers tend to cater to the 'built' motors that flow better than stock.

Paul

Well now, I had just the opposite understanding. I thought the S/A line was basically offered as a stock replacement, or for lightly modded engine.

I've always liked Holley's, but I also read lots of stories about them being finickey to tune (not that they can't...ya just gotta tweak on 'em). The S/A line is supposed to be Holley's "bolt 'er on & GO" set-up, being marketed to counter this line of thought...kinda like Edelbrocks, but less spendy.

classicchev · 02-03-2007, 07:01 PM

Edelbrock for me, Holleys are kind of a pain to tune properly, just my opinion though

Psycho71 · 02-03-2007, 08:36 PM

The Street Avenger I got works great. I had to change the power valve and accel. pump cam on mine to eliminate a slight hesitation. And the reason, from Holley Tech, is that I'm running a mild cam and headers. And I went too big (670), to accomidate some future upgrades. Both were very easy fixes that cost less than $20 total. If I had gotten the 570, it would have been a breeze.

All that said, I think the Street Avenger is a fine carb for stock to warmed up motors. Mine's got excellent throttle response, and great part throttle control.

DON'T BUY IT FROM JEG'S!!!!!!!

Look on Ebay! I got mine for $285 shipped to my door. And they even threw in a cheapie fuel line set-up. All Brand new, In the box.

Jay

Morgsie · 02-03-2007, 08:54 PM

Why not rebuild the factory carb? Or find one? No matter what you get it won't be tuned for your engine out of the box. Holly and Edlebrock are a waste of money IMO.

ClassicRedneck05 · 02-03-2007, 08:56 PM

Quote:

Originally Posted by Morgsie

Why not rebuild the factory carb? Or find one? No matter what you get it won't be tuned for your engine out of the box. Holly and Edlebrock are a waste of money IMO.

well i have the Qjet on it now just dont like it i have always been a Holley Carb person infact i have one i got for free sittin in storage but when it wa givin to me it was disassembled ad im not sure if all the screws are in it and i wouldnt know where to begin the guy told me it was a Holley 780 its also a double pumper

FarmTruk · 02-03-2007, 09:47 PM

That 770 cfm DP is a lot of carb for a stock 350 w/headers and intake. JMHO...

**WorkinLonghorn** · 02-03-2007, 10:02 PM

I'm watching this thread for advice,but I have questions too. If you have a Q-jet now then you have a spread bore mani? Is the s/a spead-bore or square? Q-jet ( at least mine) is non-electric choke,the s/a is electric choke so you'd have to change over to that I quess. The part # you gave is for a 400-500 HP engine,wouldn't the 570 cfm be better? thx

ThatOneBlue67 · 02-03-2007, 10:10 PM

Please don't get Holley. I bought a 400 dollar Street Avenger and it wouldn't even run on the preset settings. It is SUPPOSED to atleast start, but it didn't. I eventually did get it to run but it always had a delay. So I traded it for a polished Eelbrock 600CFM and the motor caught as soon as I turned the key. The Edelbrock has NO delay and the finish is beautiful. Also, the street avenger had some weird setup where ti needed to have the fuel line connected intwo places. The Eddie only needs one fuel line connection.

Did I also mention that, at the time anyway, the Edelbrock was half the price of the Holley? I'm sorry, but Holley has gone down the tubes. Some of you, I'm sure, enjoy your Holley carbs. But my little experience has pretty much made me an Edelbrock loyalist.

ghackett1 · 02-03-2007, 10:17 PM

They have a Truck Avenger Carb now. It's made especially for our heavy trucks and has great throttle response.

ThatOneBlue67 · 02-03-2007, 10:23 PM

Is it actually based on weight though? I mean, I thought it was for rock crawlers for when they become UNhorizontal or because of the bumps or something. I mean, if it figures in the fact that its a truck, thats cool. But carbs aren't that technical, are they? Maybe it has larger jets or something?

cooters · 02-04-2007, 09:44 AM

the truck series is for 4x4 where you bounce around alot. I have not had any luck with the Avenger series carbs, save the hassle and stick to qjet. I spent 3 hours on the last one i bought and still had lousy response at low end

stepside454 · 02-04-2007, 11:22 AM

Ive built 3 cars/trucks in the last 7 or 8 years & used Holley Street Avengers on all 3. & I dont have a complaint to make on any of em...cept the juck clear site plugs well eventually leak( replace them before install in my opinion.
I would first strongly consider a properly rebuilt & tuned q-jet.
If its an otherwise stock 350, its gonna stay below 5000 RPMs. I think I would use a 570 Holley. It well likely have to be jetted up a bit, & possibly a bigger booster, but itll run good.

cooters · 02-04-2007, 03:21 PM

its good to see some people have had good luck. The clear sight glass is only suppost to be used for setup and then removed and replaced with the brass ones provided.

68Stepbed · 02-05-2007, 08:23 AM

The 570 will work great on a stock 350.

Texasdeere · 02-05-2007, 10:34 AM

Use what you like brand wise. I think Autozone sell reman Q-Jets cheap too. If you use the Holley, a 600 or 650 vac secondary is plenty for your engine. As they said above the 570 will work good too.

Texasdeere · 02-05-2007, 10:40 AM

This is a quote from Bowtieguy's website reguarding cheap carb options for your truck:

Another idea, more of an improvement over increase in power, you can get a remanufactored Quadrojet carberator from a '74 Chevy truck 1/2 ton 2wd without heavy duty suspension for $106.99 plus core. Its almost as cheap to replace them then rebuild them if you look for the right parts off the right years.

I am by no means trying to promote Auto Zone, just piont out that if you look for the parts online and look for different years you CAN find parts, even the factory performance parts cheaper then the original replacement parts. These prices are specificly for for louisiana so they may very for different locations.

**WorkinLonghorn** · 02-05-2007, 12:38 PM

Quote:

I think Autozone sell reman Q-Jets cheap too.

Around here at least,Auto Zone "Lifetime Warrantee" means "Bring it in each time it breaks".

stepside454 · 02-05-2007, 04:05 PM

Yeah...I dont have much faith in Autozone or any of the big box parts stores reman stuff. If I was going to use a reman carb, Id find a reputable carb shop, or do it myself.

bryanw1968 · 02-05-2007, 05:13 PM

IMHO anytime you are talking about a vacuum secondary carb it will work with a stock motor as long as you picked the right size and they jets are appropriately sized.

I'm a Barry Grant fan as far as carbs go.....

agronomya · 02-05-2007, 06:06 PM

I would say go with a q-jet or an Edelbrock even though I don't like their design. Once you get one set to perfect you should never have to touch it again until you change something on your truck.
I am a Holley fan personally and I do agree to some extent that they have gone down the drain. My '69 currently has a 600 cfm Edelbrock (1406) that I just rebuilt (pain in the a** by the way).
I plan to switch to a 625 Road Demon Jr. as soon as I have the money. I have heard some good and bad things about them but I like the look and finish I have seen at some shows. I would like to hear some feedback on Demons if anyone has any.

67cruiser · 02-05-2007, 06:07 PM

I would just rebuild the Q-jet rebuild kit is only $13.00 and they are very easy to rebuild. Another good thing about them is they work great on (for the most part stock engines).

02-03-2007, 06:08 PM	#1
ClassicRedneck05 Senior Member Join Date: Dec 2005 Location: Humble, Texas Posts: 262	Holley Carbs was wondering if this would be a good carb for my truck its a 1972 Chevrolet C-10 with a 350 and TH350 transmission stock stock motor except added headers i do have an intake or it as well now.. here is the link and its part #510-O-80770 http://www.jegs.com/webapp/wcs/store...49689_-1_10271 __________________ Redneck Rampage 1972 Chevrolet C-10 LWB 350 1972 Chevrolet K-20 LWB 502 LiFtEd

02-03-2007, 06:32 PM	#2
Paul72 Registered User Join Date: Sep 2003 Location: Waterloo, IA Posts: 1,147	Re: Holley Carbs It would work, but with a stock motor, it may be an unwise use of $$. A regular Holley with vacuum secondaries, either 600 or 650CFM would work just as good IMO. The avengers tend to cater to the 'built' motors that flow better than stock. Paul __________________ '72 Chevy K20 - 383/4sp/205 - SOLD after 41 years in the family Next project - K/5 Tahoe (71 Blazer on 99 Tahoe chassis) Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=789958

02-03-2007, 07:01 PM	#4
classicchev Senior Member Join Date: Nov 2003 Location: Calgary Alberta Posts: 1,936	Re: Holley Carbs Edelbrock for me, Holleys are kind of a pain to tune properly, just my opinion though __________________ 67- 72 Parts collecter

02-03-2007, 08:54 PM	#6
Morgsie Registered User Join Date: Apr 2005 Location: BC, Canada Posts: 122	Re: Holley Carbs Why not rebuild the factory carb? Or find one? No matter what you get it won't be tuned for your engine out of the box. Holly and Edlebrock are a waste of money IMO.

02-03-2007, 09:47 PM	#8
FarmTruk In Memoriam... Join Date: Nov 2006 Location: Wallburg, NC Posts: 1,216	Re: Holley Carbs That 770 cfm DP is a lot of carb for a stock 350 w/headers and intake. JMHO... __________________ '68 C10 SWB 307ci 2BBL *FarmTruk Pics Here* *"You know, doing what is right is easy. The problem is knowing what is right."*

02-03-2007, 08:36 PM	#5
Psycho71 Registered User Join Date: Jan 2006 Location: Kaufman, Tx Posts: 827	Re: Holley Carbs The Street Avenger I got works great. I had to change the power valve and accel. pump cam on mine to eliminate a slight hesitation. And the reason, from Holley Tech, is that I'm running a mild cam and headers. And I went too big (670), to accomidate some future upgrades. Both were very easy fixes that cost less than $20 total. If I had gotten the 570, it would have been a breeze. All that said, I think the Street Avenger is a fine carb for stock to warmed up motors. Mine's got excellent throttle response, and great part throttle control. DON'T BUY IT FROM JEG'S!!!!!!! Look on Ebay! I got mine for $285 shipped to my door. And they even threw in a cheapie fuel line set-up. All Brand new, In the box. Jay __________________ You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. If a hammer doesn't fix it, you have an electrical problem! Slot Cars, 1:24 Scale, 100MPH@100,000RPM, fastest things on wheels!

02-03-2007, 10:02 PM	#9
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,873	Re: Holley Carbs I'm watching this thread for advice,but I have questions too. If you have a Q-jet now then you have a spread bore mani? Is the s/a spead-bore or square? Q-jet ( at least mine) is non-electric choke,the s/a is electric choke so you'd have to change over to that I quess. The part # you gave is for a 400-500 HP engine,wouldn't the 570 cfm be better? thx __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

02-03-2007, 10:10 PM	#10
ThatOneBlue67 I survived Dead Man's Curve. Join Date: Apr 2006 Location: The Nine-Five-687 Posts: 389	Re: Holley Carbs Please don't get Holley. I bought a 400 dollar Street Avenger and it wouldn't even run on the preset settings. It is SUPPOSED to atleast start, but it didn't. I eventually did get it to run but it always had a delay. So I traded it for a polished Eelbrock 600CFM and the motor caught as soon as I turned the key. The Edelbrock has NO delay and the finish is beautiful. Also, the street avenger had some weird setup where ti needed to have the fuel line connected intwo places. The Eddie only needs one fuel line connection. Did I also mention that, at the time anyway, the Edelbrock was half the price of the Holley? I'm sorry, but Holley has gone down the tubes. Some of you, I'm sure, enjoy your Holley carbs. But my little experience has pretty much made me an Edelbrock loyalist. __________________ "The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive *Cherry Bomb...* Disturbing the Peace Since 1968.

02-03-2007, 10:17 PM	#11
ghackett1 68 C10 Longbed Join Date: Sep 2006 Location: Naples, Florida Posts: 520	Re: Holley Carbs They have a Truck Avenger Carb now. It's made especially for our heavy trucks and has great throttle response.

02-03-2007, 10:23 PM	#12
ThatOneBlue67 I survived Dead Man's Curve. Join Date: Apr 2006 Location: The Nine-Five-687 Posts: 389	Re: Holley Carbs Is it actually based on weight though? I mean, I thought it was for rock crawlers for when they become UNhorizontal or because of the bumps or something. I mean, if it figures in the fact that its a truck, thats cool. But carbs aren't that technical, are they? Maybe it has larger jets or something? __________________ "The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive *Cherry Bomb...* Disturbing the Peace Since 1968.

02-04-2007, 09:44 AM	#13
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: Holley Carbs the truck series is for 4x4 where you bounce around alot. I have not had any luck with the Avenger series carbs, save the hassle and stick to qjet. I spent 3 hours on the last one i bought and still had lousy response at low end

02-04-2007, 11:22 AM	#14
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Re: Holley Carbs Ive built 3 cars/trucks in the last 7 or 8 years & used Holley Street Avengers on all 3. & I dont have a complaint to make on any of em...cept the juck clear site plugs well eventually leak( replace them before install in my opinion. I would first strongly consider a properly rebuilt & tuned q-jet. If its an otherwise stock 350, its gonna stay below 5000 RPMs. I think I would use a 570 Holley. It well likely have to be jetted up a bit, & possibly a bigger booster, but itll run good. __________________ 75 GMC C-15 short/step factory 454, lowered

02-04-2007, 03:21 PM	#15
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: Holley Carbs its good to see some people have had good luck. The clear sight glass is only suppost to be used for setup and then removed and replaced with the brass ones provided.

02-05-2007, 08:23 AM	#16
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Holley Carbs The 570 will work great on a stock 350. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

02-05-2007, 10:34 AM	#17
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Holley Carbs Use what you like brand wise. I think Autozone sell reman Q-Jets cheap too. If you use the Holley, a 600 or 650 vac secondary is plenty for your engine. As they said above the 570 will work good too.



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02-05-2007, 10:40 AM	#18
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Holley Carbs This is a quote from Bowtieguy's website reguarding cheap carb options for your truck: Another idea, more of an improvement over increase in power, you can get a remanufactored Quadrojet carberator from a '74 Chevy truck 1/2 ton 2wd without heavy duty suspension for $106.99 plus core. Its almost as cheap to replace them then rebuild them if you look for the right parts off the right years. I am by no means trying to promote Auto Zone, just piont out that if you look for the parts online and look for different years you CAN find parts, even the factory performance parts cheaper then the original replacement parts. These prices are specificly for for louisiana so they may very for different locations.

02-05-2007, 04:05 PM	#20
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Re: Holley Carbs Yeah...I dont have much faith in Autozone or any of the big box parts stores reman stuff. If I was going to use a reman carb, Id find a reputable carb shop, or do it myself. __________________ 75 GMC C-15 short/step factory 454, lowered

02-05-2007, 05:13 PM	#21
bryanw1968 Senior Member Join Date: Jul 2006 Location: Leander, Texas Posts: 850	Re: Holley Carbs IMHO anytime you are talking about a vacuum secondary carb it will work with a stock motor as long as you picked the right size and they jets are appropriately sized. I'm a Barry Grant fan as far as carbs go.....

02-05-2007, 06:06 PM	#22
agronomya Junior Member Join Date: Jan 2007 Location: Lubbock, TX Posts: 77	Re: Holley Carbs I would say go with a q-jet or an Edelbrock even though I don't like their design. Once you get one set to perfect you should never have to touch it again until you change something on your truck. I am a Holley fan personally and I do agree to some extent that they have gone down the drain. My '69 currently has a 600 cfm Edelbrock (1406) that I just rebuilt (pain in the a** by the way). I plan to switch to a 625 Road Demon Jr. as soon as I have the money. I have heard some good and bad things about them but I like the look and finish I have seen at some shows. I would like to hear some feedback on Demons if anyone has any. __________________ They call me, "AA." 1969 Chevy LWB-SDPC 350, TH400, old farm truck http://s123.photobucket.com/albums/o299/agronomya/ 2006 Nissan Altima-For my 2000 miles a month

02-05-2007, 06:07 PM	#23
67cruiser Registered User Join Date: Dec 2006 Location: OKLAHOMA Posts: 140	Re: Holley Carbs I would just rebuild the Q-jet rebuild kit is only $13.00 and they are very easy to rebuild. Another good thing about them is they work great on (for the most part stock engines). __________________ 67 C10 SWB 350-Turbo 400 tranny-Disc brake "Those who live by the sword get shot by those who don't"

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