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#1 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Carb Questions
I have a 69 Chevy C10 with pretty stock 350 in it... i have a 670 cfm Street avenger on it now and i think my engine can not handle the cfm... i am looking at getting a new carb... what is the best out of the box carb for my engine?
Also do you think my mechanical stock fuel pump provides enough fuel to the current carb? i am having trouble with it dyeing when i am idled down or at a stop light... thanks ![]()
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1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#2 |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
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Re: Carb Questions
well i don't think that it's too big for the motor. the stock q-jets were actually alot larger than that. i would check your timing. but if you are still thinking of swapping carbs i would go with an edelbrock 1405(manual choke) or 1406(electric choke). both are 600 cfm. they are easy to tune and should run just fine right out of the box.
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ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 |
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#3 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Carb Questions
I have an Edelbrock Q-Jet (750cfm) on my stock-block 350. It has had no issues with that size carb. Smaller primaries are the key to that issue. I don't think that the CFM ratings are necessarily met as we have them installed. Engines are just air pumps. Getting the air to move involves several factors, from reducing the intake restrictions to relieving the backpressure and making sure the air can move through the intake and exhaust.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#4 |
Junior Member
Join Date: Jul 2007
Location: Odenton, Md
Posts: 552
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Re: Carb Questions
I have an electric choke q-jet
(xtra) if you want to try it? It work fine...just bought a new carb...I will sell it for cheap if you need it..
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going to sell this one...looking for a SWB project next. Last edited by Jcentsr6; 12-04-2007 at 08:23 PM. |
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#5 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Re: Carb Questions
I have had this carb for a few months and it is a learning exper. for me... i know nothing about carbs... got this one from a friend cheap.... Any help will be appreciated! THANKS
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1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#6 |
Registered User
Join Date: Apr 2007
Location: brownwood, texas
Posts: 34
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Re: Carb Questions
have you tried to adjust the ideal mixture screws, on my 750 it will die if the screws are set in to lean.
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#7 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Carb Questions
Why not just jet it down a few sizes if ya think its too big, those guys are only $5 as opposed to a new carb. Did you adjust your idle mixture and floats when you put the new carb on? What is your timing set at?
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. Last edited by webfoot; 12-04-2007 at 09:46 PM. |
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#8 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Re: Carb Questions
timing is just right of the timing light center... i have been trying to adjust the idle screws.... i am kinda new to all this and learning about it.... any good referneces to setting timing and all?
__________________
1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#9 | |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Carb Questions
Quote:
Also, your timing is slightly retarded. If your cam is stock try for 2-4 degrees btdc initial. (vac advance plugged) Get your timing squared away before adjusting the idle mixture screws BTW.
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#10 | |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
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Re: Carb Questions
Quote:
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__________________
ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 |
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#11 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Carb Questions
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#12 | |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Carb Questions
Quote:
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. Last edited by webfoot; 12-05-2007 at 10:00 AM. |
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#13 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Carb Questions
Quote:
Stock engine, figure 75% VE, your engine needs only 646 CFM @ 8500 RPM...your carb sizing is fine ![]() Your stock fuel pump is providing 60+ GPH to about 5500 RPM - PLENTY for your engine. If the engine is dying at idle look for a vacuum leak, incorrect timing or a poor idle setting (mixture or RPM) including an incorrectly adjusted choke. Bottom line is that you don't need any new parts - just some time getting everything set right ![]() |
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#14 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Carb Questions
Check here and you will see some excellent pics and info to help you.
http://www.jegs.com/InstallationInst...10-0-80670.pdf
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#15 |
Registered User
Join Date: Aug 2007
Location: Greenfield, MO
Posts: 215
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Re: Carb Questions
well my 2 cents worth is to pickup a cheapo mr gasket co. fuel pressure guage and some fittings and put it in yur fuel line. I did it on my new Edelbrock 1450 600CFM (man choke) carb. I dunno bout holley but the edel's say not more than 6 ur maybe 6.5 psi or you'll flood it out. So to make sure i was good i put that in and had a fuel pressure reg. sittin there too. I was able to take the reg back cuz i didnt need it. But yeah. I'd be checkin pressure 2 c wut i had. Just sumthin else to eliminate as cause. Ive never been a big holley fan anyways. I have a 307 with a Holley intake and edel carb and i think my intake is limiting me a LOT. not sre though. Anyways, long post to say somthing simple so i'll quit now. lol. Good luck in yur quest.
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#16 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Carb Questions
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#17 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: Carb Questions
Holley has a big well known name, that's it. they have nothing more that that for the average guy. they have their place and it is not on a daily driven stock engine. I know Chevy used to sell HP cars with them but think about why they stopped and had Rochester Qjets from the late 60s until the late 80s.
I for one can make a Holley run like a scalded dog but it takes a butt-load of time and money to make it reliable on a DD. (I could go into depth about my 80 K20 with my HIGHLY modified holley that got 17MPG and made killer torque but that's another subject) for the average guy with a daily driver and especially a stock engine it is hard to beat a well chosen Q-jet or properly set up Edelbrock. |
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#18 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Carb Questions
Quote:
The QJet is still the all-around champ for driveability, and I've recently become a big Edelbrock fan as well...but I would consider the Edelbrock Performer and the Street/Truck Avengers to be equal. |
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#19 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Carb Questions
Best out of box for stock 350:
-570 Street Avenger -500 Holley 2-barrel -500 Edelbrock manual choke It's always better to figure smaller is better. I've seen alot of people put too big of a carb on too small of an engine and have lots of problems. I've never had any luck with carbs bigger than 600 cfm on stock 350's. The only good Edelbrock I ever had was a 500 manual choke. That engine ran better than any stock 350 I've ever driven. The 670 you have is a great carb and can be adjusted alot cheaper than buying a new carb. Here's what I did. Buy books on Holley carbs!! I knew nothing about them at first like you, but once I got started working on them, they're actually pretty simple and easy to work on. The only hard part was learning the right combination to get all parts to work right together. Also, call Holley. 1-800-HOLLEY1 Ask for tech support and tell them you have a Street Avenger carb. They will send you to the guru that designed the SA line. He helped me alot when I had trouble with mine. They have great customer support that will help you any way possible. Edit-I also noticed you're in KY. Holley is in Bowling Green. What part of KY are you in?
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Last edited by 68Stepbed; 12-05-2007 at 04:17 PM. |
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#20 |
RIP BigDaddyDave ~7-23-09~ You will be missed~
Join Date: Aug 2007
Location: Concord NC
Posts: 1,361
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Re: Carb Questions
I have the avenger on my stock 350,and i could not be more pleased.I think it was almost perfect out of the box,i have never turned a single setting on it!
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BigDaddyDave's Truck: http://www.flickr.com/photos/daves71chevy/ | See it in Action! |
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#21 |
Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: Carb Questions
about yuor fuel pump.
if its dying at an idle, the fuel pump isn't a problem. a good stock pump should EASILY be able to keep up at an idle. if it was bogging at 6000 rpm, that might be a different story.
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. Last edited by 69halfton; 12-05-2007 at 10:18 PM. |
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#22 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: Carb Questions
a mechanical fuel pump CAN fail the other way. they CAN put out too much fuel. I wouldn't have believed it myself but mine did that last winter. it was spewing out the bowl vents at idle. I thought I had a sunk/stuck float so I did a carb kit and float. still did it until I changed the 2 year old pump.
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#23 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Carb Questions
Hooker, what is your exact setup? What kind of intake, dist., wires, plugs, etc.? There could be lots of factors causing the problem. Let us know what you have and we'll try to help you more with better info. It's vary hard to diagnose a problem just by telling us you have a stock 350 with a 670 Holley. It could be something simple(it usually is).
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#24 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Re: Carb Questions
It is a mid 70s (i think) 350 with 350 tranny.... stock intake and street avenger 670 cfm..... barry white HEI with oreilly wires and bosch plugs
__________________
1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#25 | |
Registered User
Join Date: Oct 2006
Location: Oshkosh, WI
Posts: 101
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Re: Carb Questions
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