what carb are all you bbc folks running ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bo-w · 05-29-2011, 04:25 AM

so im just wondering what you all with 396-402 big blocks are running for a carb, and if you have gone smaller for mpg? any input is great, oh along with carb what other mods (engine wise ) are you running ? thanks all.

JimKshortstep4x4 · 05-29-2011, 05:27 AM

I am running the stock Q-jet. With the smaller primaries and large secondaries it works very well on the big blocks.

JIm

don t. - 72gmc · 05-29-2011, 06:38 AM

Quote:

Originally Posted by JimKshortstep4x4

I am running the stock Q-jet. With the smaller primaries and large secondaries it works very well on the big blocks.

JIm

+1 with a stock 396/400/402

sstone69 · 05-29-2011, 07:04 AM

Stock Q-jet on my 396
Posted via Mobile Device

landsurvey1 · 05-29-2011, 10:14 AM

Edelbrock 750, 465 BB, 400HP and 450 lb/ft Torque.

Longhorn Man · 05-29-2011, 10:17 AM

I had a quadra jet rebuilt for my 402, I had thought it was a big block carb when I had it done, ran like crap. Bought an Edelbrock 750 (same as on the cad 425) and love it.
I guess once I get the small motor ready for the longhorn I have a fresh quadra jet for it.

bruin_d · 05-29-2011, 10:34 AM

750 Edelbrock here

Shyguy · 05-29-2011, 12:00 PM

I am running the stock Q-jet off of my 350 on a stock 454 and it is working out ok.

bo-w · 05-29-2011, 03:22 PM

Thanks all I'm just weighing options . Iv got a holley 570 was going to use on a small block I don't have any more . Way too small I'll probably sell and get a 700 + cfm for the truck thx again
Posted via Mobile Device

A.T. RockDriller · 05-29-2011, 06:39 PM

As an old Mr. Goodwrench graduate........(1978 thru 1983).........
Wentworth Chevrolet Truck Shop......... Portland, Oregon
I learned all the tricks from the best of the best on how to repair....modify....
or maximize the Rochester Q-jet.
There is no doubt, if done properly, that the R-Chester 4-Jet is the best carb available for BBC heavy duty applications.
A good Q-jet tech can give you the best performance and economy from the same carb if ya' give him time to Dyno or road test the jet & needle sets...
Most anyone who has ever jumped into a rig with a big-block and stepped on it got quite a thrill either from "off the line" or from the mid rpm torque curve, but if you invest some time & patience into it......you can get the full yield of torque possible...bottom to top....from your BBC with that carb.
You can get pretty close by the #'s on the bench.
But by actually putting the engine to work, you can find that magic combination that makes that big-block just sing....
Just sayin'........(not sellin')

A.T. RockDriller · 05-29-2011, 06:47 PM

For the record....
We recorded well over 1000 CFM on the stock Q-Jet off of a '76 454 truck on the bench.
That's a ton of air.
Needless to say..... you sure do need to get it right on the fuel/metering end.

There should be a Q-Jet wizard somewhere near you.
He's probably really old....or busy fishin'.

bo-w · 05-29-2011, 10:18 PM

Quote:

Originally Posted by A.T. RockDriller

For the record....
We recorded well over 1000 CFM on the stock Q-Jet off of a '76 454 truck on the bench.
That's a ton of air.
Needless to say..... you sure do need to get it right on the fuel/metering end.

There should be a Q-Jet wizard somewhere near you.
He's probably really old....or busy fishin'.

lol thanks for the input A.T. RockDriller i'll keep it in mind . I have rebuilt 2 Q-jets (stock rebuilds) with success it was just a P.I.T.A . i really like Holleys for simplicity of tunning and parts support. I am new to my area so i dont know about a Q-jet guru here. I also dont really know the finer ins and outs of the Q-jets so maby I will do a bit more research on the matter . thanks again

**70cst** · 05-29-2011, 10:33 PM

Stock Q-jet on my 402 Just got it refurbished and its on its way to Ohio from Ca.

prostreetC-10 · 05-30-2011, 01:32 AM

Quote:

Originally Posted by A.T. RockDriller

We recorded well over 1000 CFM on the stock Q-Jet off of a '76 454 truck on the bench.

Hmmm.....having a really hard time buying it. What flow bench did you use? You're telling me you got a stock 750 to well over 1,000? Please provide details.

bo-w · 05-29-2011, 10:58 PM

awsome 70cst thank you much for the info.

**Tom Vogel** · 05-30-2011, 10:05 AM

The Quadrajet is an awesome carb if rebuilt correctly.. I would suggest the Carb Shop in Ontario Ca. Just cleaning it and putting in a carb kit is Not a rebuild. just sayin.

Gobbles · 05-30-2011, 10:07 AM

Holley 600 CFM on 454!

71Longbed · 05-30-2011, 12:06 PM

750 Mighty Demon on a 454

05-29-2011, 04:25 AM	#1
bo-w Registered User Join Date: May 2011 Location: sacramento Ca Posts: 84	what carb are all you bbc folks running ? so im just wondering what you all with 396-402 big blocks are running for a carb, and if you have gone smaller for mpg? any input is great, oh along with carb what other mods (engine wise ) are you running ? thanks all.

05-29-2011, 05:27 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: what carb are all you bbc folks running ? I am running the stock Q-jet. With the smaller primaries and large secondaries it works very well on the big blocks. JIm __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

05-29-2011, 07:04 AM	#4
sstone69 Registered User Join Date: Oct 2010 Location: Tucker, GA Posts: 128	Re: what carb are all you bbc folks running ? Stock Q-jet on my 396 Posted via Mobile Device __________________ "You gonna pull them pistols or whistle dixie ?"

05-29-2011, 10:14 AM	#5
landsurvey1 Registered User Join Date: Jan 2009 Location: Arizona Posts: 404	Re: what carb are all you bbc folks running ? Edelbrock 750, 465 BB, 400HP and 450 lb/ft Torque.

05-29-2011, 10:17 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: what carb are all you bbc folks running ? I had a quadra jet rebuilt for my 402, I had thought it was a big block carb when I had it done, ran like crap. Bought an Edelbrock 750 (same as on the cad 425) and love it. I guess once I get the small motor ready for the longhorn I have a fresh quadra jet for it.

05-29-2011, 10:34 AM	#7
bruin_d Registered User Join Date: Mar 2011 Location: Chesapeake, VA Posts: 578	Re: what carb are all you bbc folks running ? 750 Edelbrock here __________________ My 72 Suburban Build - http://67-72chevytrucks.com/vboard/s...d.php?t=454019 79 Volvo Turbo LS Build - http://67-72chevytrucks.com/vboard/s...d.php?t=594252 Buggy Bed for son - http://67-72chevytrucks.com/vboard/s...d.php?t=657350

05-29-2011, 12:00 PM	#8
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: what carb are all you bbc folks running ? I am running the stock Q-jet off of my 350 on a stock 454 and it is working out ok. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

05-29-2011, 03:22 PM	#9
bo-w Registered User Join Date: May 2011 Location: sacramento Ca Posts: 84	Re: what carb are all you bbc folks running ? Thanks all I'm just weighing options . Iv got a holley 570 was going to use on a small block I don't have any more . Way too small I'll probably sell and get a 700 + cfm for the truck thx again Posted via Mobile Device

05-29-2011, 06:39 PM	#10
A.T. RockDriller Registered User Join Date: Feb 2011 Location: Orient, Oregon Posts: 722	Re: what carb are all you bbc folks running ? As an old Mr. Goodwrench graduate........(1978 thru 1983)......... Wentworth Chevrolet Truck Shop......... Portland, Oregon I learned all the tricks from the best of the best on how to repair....modify.... or maximize the Rochester Q-jet. There is no doubt, if done properly, that the R-Chester 4-Jet is the best carb available for BBC heavy duty applications. A good Q-jet tech can give you the best performance and economy from the same carb if ya' give him time to Dyno or road test the jet & needle sets... Most anyone who has ever jumped into a rig with a big-block and stepped on it got quite a thrill either from "off the line" or from the mid rpm torque curve, but if you invest some time & patience into it......you can get the full yield of torque possible...bottom to top....from your BBC with that carb. You can get pretty close by the #'s on the bench. But by actually putting the engine to work, you can find that magic combination that makes that big-block just sing.... Just sayin'........(not sellin') __________________ Les Hunter '59 3803 someday to be 3853 '63 GMC K1000...351E, TH400 Daily '66 GMC 4000...351C, 5&2

05-29-2011, 06:47 PM	#11
A.T. RockDriller Registered User Join Date: Feb 2011 Location: Orient, Oregon Posts: 722	Re: what carb are all you bbc folks running ? For the record.... We recorded well over 1000 CFM on the stock Q-Jet off of a '76 454 truck on the bench. That's a ton of air. Needless to say..... you sure do need to get it right on the fuel/metering end. There should be a Q-Jet wizard somewhere near you. He's probably really old....or busy fishin'. __________________ Les Hunter '59 3803 someday to be 3853 '63 GMC K1000...351E, TH400 Daily '66 GMC 4000...351C, 5&2

05-29-2011, 10:33 PM	#13
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: what carb are all you bbc folks running ? Stock Q-jet on my 402 Just got it refurbished and its on its way to Ohio from Ca. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! Last edited by 70cst; 05-29-2011 at 10:34 PM.

05-29-2011, 10:58 PM	#15
bo-w Registered User Join Date: May 2011 Location: sacramento Ca Posts: 84	Re: what carb are all you bbc folks running ? awsome 70cst thank you much for the info.

05-30-2011, 10:05 AM	#16
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,565	Re: what carb are all you bbc folks running ? The Quadrajet is an awesome carb if rebuilt correctly.. I would suggest the Carb Shop in Ontario Ca. Just cleaning it and putting in a carb kit is Not a rebuild. just sayin.

05-30-2011, 10:07 AM	#17
Gobbles Registered User Join Date: Sep 2010 Location: British Columbia Posts: 484	Re: what carb are all you bbc folks running ? Holley 600 CFM on 454! __________________ Trevor "You already said spite"

05-30-2011, 12:06 PM	#18
71Longbed Not Mine But A beauty Join Date: Aug 2004 Location: Southern CaL Posts: 368	Re: what carb are all you bbc folks running ? 750 Mighty Demon on a 454 __________________ 68 Chevy Shortbed 454/400 2000 Chevrolet Camaro SS 6spd 2011 Silverado 5.3 6spd auto



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.