opinions on carb and intake manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68black_betty · 07-22-2010, 08:12 PM

im lookin into to getting a higher performance carb and intake for my 68 c10 with 454, ive been lookin into the holley 750 and the edelbrock performer intake, im just lookin for some opinions and advice on what carb and intake would be better performance wise

68black_betty · 07-22-2010, 08:39 PM

also recommendations for a bigger cam

capev86 · 07-22-2010, 09:06 PM

carb: a 750 holley is NOT an improvement over a good old q-jet (also a 750). GM ran them on all their top muscle cars back in the day. you can't beat the balance of efficiency and power that comes from a spread bore design. only thing out there that is better is a nice fuel injection system.

intake: remember that big blocks are low rpm motors and like a daily driver, do not benefit from an intake tuned to start developing power at higher engine speeds.

cam: roller valvetrain is the smart way to go....less valvetrain wear and tear and less power bled off as friction. another piece you will want to benefit the idle - 5000 rpm range on a street truck.

red69ss · 07-22-2010, 10:06 PM

you are going to get a bunch of different opinions on this subject its one of the most colorful subjects I've seen discussed here. In my experience I have had the best luck with holleys they are pretty simple to work on and tune as I am no carb tech. I love the sound of a quadrajet being opened up , but in my experience they are not novice friendly , I've had a couple rebuilt and never felt like I had them tuned right( never tried one of the factory rebuilt ones) , most the new carbs( holleys and edelbrocks) are pretty much bolt on and go. not a big fan of the edelbrocks but a lot of guys love them. I have a holley 750 on my 454 and it performs well, this is a tough decision to make good luck

1969stepside · 07-22-2010, 10:58 PM

air gap and qjet

**tkeduk8r** · 07-23-2010, 02:16 AM

"air gap and qjet"

ditto!!!!
--Mike

68Stepbed · 07-23-2010, 07:57 AM

I agree with the Q-jet being better, but if you do want to run a Holley, a 750 may not be the best size. Look into the 650 cfm range. The smaller cfm will give you better throttle response, better driveability, and actually, more horsepower.

After you pick your cam and intake, figure out what heads you have and the specifics on them. Then call somebody like The Carb Shop or QFT and they'll actually match a carb to what you have.

cdowns · 07-23-2010, 08:24 AM

i like multicarb setups// i'd go twin carbs on a midrise manifold on a bigblock// alot depends on specs

without knowing specs a cam suggestion is useless// i spend lots of time with companies on thier tech line doing research to pick a cam to work properly in my applications

marks1972 · 07-23-2010, 09:17 AM

i agree with Cdowns on the cam. call tech lines. give them your specs and let them know what you are looking for out of your engine (performance-vs-rpm range). they can also assist you on the intake and carb size for what you are looking for.

carb brand is up to you.
me personally i perfer the edelbrock.
edelbrock - better for cruzen - a little harder to adjust but once it is set it is done.
Holly - better for racing - easyer to adjust out but one backfire and you are off to the store for anotherone.
qjet - if you have someone that is knows them well and is good with them you cant beet em however if you dont you will be fighting with them contently they are tempermentaly and dont like it at all when someone touches them that dont know what they are doing.

these are all just my opinions though.

07-22-2010, 08:12 PM	#1
68black_betty Registered User Join Date: Jul 2010 Location: Tacoma, WA........Ottawa, IL Posts: 69	opinions on carb and intake manifold im lookin into to getting a higher performance carb and intake for my 68 c10 with 454, ive been lookin into the holley 750 and the edelbrock performer intake, im just lookin for some opinions and advice on what carb and intake would be better performance wise

07-22-2010, 08:39 PM	#2
68black_betty Registered User Join Date: Jul 2010 Location: Tacoma, WA........Ottawa, IL Posts: 69	Re: opinions on carb and intake manifold also recommendations for a bigger cam

07-22-2010, 09:06 PM	#3
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: opinions on carb and intake manifold carb: a 750 holley is NOT an improvement over a good old q-jet (also a 750). GM ran them on all their top muscle cars back in the day. you can't beat the balance of efficiency and power that comes from a spread bore design. only thing out there that is better is a nice fuel injection system. intake: remember that big blocks are low rpm motors and like a daily driver, do not benefit from an intake tuned to start developing power at higher engine speeds. cam: roller valvetrain is the smart way to go....less valvetrain wear and tear and less power bled off as friction. another piece you will want to benefit the idle - 5000 rpm range on a street truck.

07-22-2010, 10:06 PM	#4
red69ss Burnouts are therapeutic Join Date: Jun 2007 Location: lancaster, south carolina Posts: 852	Re: opinions on carb and intake manifold you are going to get a bunch of different opinions on this subject its one of the most colorful subjects I've seen discussed here. In my experience I have had the best luck with holleys they are pretty simple to work on and tune as I am no carb tech. I love the sound of a quadrajet being opened up , but in my experience they are not novice friendly , I've had a couple rebuilt and never felt like I had them tuned right( never tried one of the factory rebuilt ones) , most the new carbs( holleys and edelbrocks) are pretty much bolt on and go. not a big fan of the edelbrocks but a lot of guys love them. I have a holley 750 on my 454 and it performs well, this is a tough decision to make good luck __________________ 1969 CHEVELLE SS 1972 C10 ALMOST DAILY DRIVER 1968 C10 RUSTBUCKET (MISSION IMPOSSIBLE) 1972 PONTIAC LEMANS CONVERTIBLE (WIFE'S CAR) "My wife and I were happy for twenty years. Then we met." - Rodney Dangerfield "The difference between genius and stupidity is that genius has its limits." - Einstein

07-22-2010, 10:58 PM	#5
1969stepside Registered User Join Date: Feb 2008 Location: Johnson City Tennessee Posts: 1,191	Re: opinions on carb and intake manifold air gap and qjet __________________ Greater love hath no man than to lay down his life for a friend. Members i Have met Earl Slick68 1969 Stepside Build thread http://67-72chevytrucks.com/vboard/s...=1#post4253546 Chevy Trucks the longest lasting most dependable trucks on the road

07-23-2010, 02:16 AM	#6
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: opinions on carb and intake manifold "air gap and qjet" ditto!!!! --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

07-23-2010, 07:57 AM	#7
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: opinions on carb and intake manifold I agree with the Q-jet being better, but if you do want to run a Holley, a 750 may not be the best size. Look into the 650 cfm range. The smaller cfm will give you better throttle response, better driveability, and actually, more horsepower. After you pick your cam and intake, figure out what heads you have and the specifics on them. Then call somebody like The Carb Shop or QFT and they'll actually match a carb to what you have. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

07-23-2010, 08:24 AM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: opinions on carb and intake manifold i like multicarb setups// i'd go twin carbs on a midrise manifold on a bigblock// alot depends on specs without knowing specs a cam suggestion is useless// i spend lots of time with companies on thier tech line doing research to pick a cam to work properly in my applications __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 07-23-2010 at 08:45 AM.

07-23-2010, 09:17 AM	#9
marks1972 Registered User Join Date: May 2010 Location: Atoka, TN Posts: 240	Re: opinions on carb and intake manifold i agree with Cdowns on the cam. call tech lines. give them your specs and let them know what you are looking for out of your engine (performance-vs-rpm range). they can also assist you on the intake and carb size for what you are looking for. carb brand is up to you. me personally i perfer the edelbrock. edelbrock - better for cruzen - a little harder to adjust but once it is set it is done. Holly - better for racing - easyer to adjust out but one backfire and you are off to the store for anotherone. qjet - if you have someone that is knows them well and is good with them you cant beet em however if you dont you will be fighting with them contently they are tempermentaly and dont like it at all when someone touches them that dont know what they are doing. *these are all just my opinions* though**. __________________ Mark 1968 C-10 SWB 307/munci 4spd/411possi 1986-1990 1972 Cheyenne-10 LWB 350/TH350 IF SHE WHOULD HAVE KEEPT THE SHIRT ON THEY WOULDNT HAVE BROKEN UP THANKS ADAM SANDLER U. S. Navy Seabee "CAN DO", "The difficult we do at once. The impossible may take a little bit longer.","We Build We Fight", "Work Hard Play Hard"



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