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#26 |
Registered User
Join Date: Nov 2013
Location: nantucket mass.
Posts: 65
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Re: How to select carb?
This is not meant to be a hijack thread but how do you tell which carb is on it now and how many cfm it is? I have the same issue here . I want an easy driver that runs smooth and economical Erik
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#27 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: How to select carb?
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#28 | ||
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,162
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Re: How to select carb?
Quote:
Quote:
But I bought his book and rebuild kit and did the rest of it myself. Take lots of pics pulling it apart for reference during reassembly. Take your time, and be patient. Follow all of his guidance in the book. I couldn't be happier. Truck has been running great ever since.
__________________
1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. ![]() |
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#29 |
Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 512
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Re: How to select carb?
Currently installed Holley carb # List-3310-3. Link showing specs.
http://1970mgr.org/_HolleyCarbs.htm |
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#30 |
Registered User
Join Date: Nov 2014
Location: Buckeye, Az
Posts: 122
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Re: How to select carb?
Anyone know what carb this is by any chance.
Thanks, Mondo |
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#31 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: How to select carb?
Holley 4360.
Quadrajet replacement. 450 cfm. |
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#32 |
Registered User
![]() Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 627
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Re: How to select carb?
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#33 |
Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: How to select carb?
I went a slightly different direction on my truck and have been very happy with it. I installed a Street Demon 625. http://www.demoncarbs.com/1900.asp
It was easy to set up, runs great. I have decent economy (13 mpg mixed driving) when I drive easy, and a good kick ion the pants when I jump on it. The carb is basically Holley's redesign of the Carter/Edelbrock design. Very easy to tune, looks nice, works great, pretty inexpensive. I actually bought mine on Amazon. Had it on there for over a year now and no issues.
__________________
Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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#34 |
Registered User
![]() Join Date: Jan 2012
Location: Washington,Il
Posts: 632
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Re: How to select carb?
sounds like you need a bolt on. Like previous hope you checked timing or previous owner didn't pop in a big cam. Weak valve springs carboned up valves.Low vacuum. worn out spark plugs,couple of less than desirable plug wires. If get where I'm goin buy a autoparts store carb and bolt it on.hopefully you hit it.there is more to it than carb.
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It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS ![]() |
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#35 | |
Registered User
![]() Join Date: Nov 2006
Location: Virginia's Eastern Shore
Posts: 91
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Re: How to select carb?
Quote:
You didn't mention which kind of manifold is in place, relevant info for your carb selection and desired results. Search out some carb sizing calculators and run a number of them, I'm pretty sure you will be surprised at the recommended sizing. The right sizing will provide the best metering signal, which translates to efficiency and good throttle response. Too big of a carb makes for sluggish air flow and poor signal. I'm with the "you're probably over-carb'd" camp. |
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#36 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: How to select carb?
I agree with the timing comments. Make sure your initial timing is right. Also make sure your total timin is correct. Adjust initial for highest vacuum. I really like Barry Grant carbs. I've had mine since 2004 and haven't had to adjust it since then. For your application id go with a 625 Road Demon.
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#37 | |
Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 512
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Re: How to select carb?
Quote:
Truck has an Edelbrock Performer EPS Intake Manifold. Has an ACCEL HEI Super Coil 140003 distributor. |
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#38 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: How to select carb?
But what's your initial timing?
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#39 |
Registered User
Join Date: Jan 2013
Location: San Antonio, TX
Posts: 733
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Re: How to select carb?
Curious guys, why not a 2 bbl Rochester -well rebuilt?
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Figure out what you want--then figure out what you are willing to give up to get it. |
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#40 | |
Registered User
![]() Join Date: Nov 2006
Location: Virginia's Eastern Shore
Posts: 91
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Re: How to select carb?
Quote:
The timing chorus has a valid point. Pretty much the golden rule to make sure your ignition is spot on before you go diddling with the carb. For that matter, you might want to check your cam timing and balancer timing mark accuracy before you bet your butt on any observed ignition timing numbers. In what condition are your timing chain and harmonic balancer? How many miles on those components? Way back when, I had a buddy "accidentally" discover he had horribly bad plug wires, after he had replaced the carb without curing the problem (rough running/ misfiring). New wires did the trick. Don't you just hate it when a simple question bogs down into such complication?! |
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#41 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: How to select carb?
Two barrel carbs big enough to work have primaries that are bigger than on a four barrel. Big primaries equal lower velocity and efficiency.
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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