help guys!!!!
Thread Starter
Instructor
Joined: Jul 2010
Posts: 236
Likes: 1
From: Odessa Texas
help guys!!!!
Im from the c5 section but dad owns a 78 
he's looking to install a new intake manifold and carburetor and asked me for help but im completely lost
What would you guys recommend? He's looking for some hp increase but nothing wild. He showed me this one
http://www.summitracing.com/parts/CM...ComboContents/
Is this kit good, or should he be looking at something else?
he's looking to install a new intake manifold and carburetor and asked me for help but im completely lost
What would you guys recommend? He's looking for some hp increase but nothing wild. He showed me this one
http://www.summitracing.com/parts/CM...ComboContents/
Is this kit good, or should he be looking at something else?
Safety Car
Joined: Oct 2000
Posts: 3,593
Likes: 103
From: Southern Indiana
Carb too small, your quadrajunk is a 650CFM.
And those Holleys are not the best type anyways.
I would piece together what you need
Like a 750 Holley vacuum secondary and that intake.
You will need a throttle bracket so you can use your whole throttle from idle to wide open, they don't cost much at all.
And those Holleys are not the best type anyways.
I would piece together what you need
Like a 750 Holley vacuum secondary and that intake.
You will need a throttle bracket so you can use your whole throttle from idle to wide open, they don't cost much at all.
Advanced
Joined: Jun 2011
Posts: 82
Likes: 0
Im from the c5 section but dad owns a 78
he's looking to install a new intake manifold and carburetor and asked me for help but im completely lost
What would you guys recommend? He's looking for some hp increase but nothing wild. He showed me this one
http://www.summitracing.com/parts/CM...ComboContents/
Is this kit good, or should he be looking at something else?
he's looking to install a new intake manifold and carburetor and asked me for help but im completely lost
What would you guys recommend? He's looking for some hp increase but nothing wild. He showed me this one
http://www.summitracing.com/parts/CM...ComboContents/
Is this kit good, or should he be looking at something else?
Good flowing aluminum heads and cam will perk it up much better.
Bottom line you can't force the engine to take more than it wants by bolting on a bigger carb. Does that make sense?
Burning Brakes
Joined: Jun 2006
Posts: 1,148
Likes: 5
From: South Dakota
Have him start out with a 260 or 268 CompCam, lifters, timing chain and spring kit. I he doesn't want to go that route, I would suggest a good tuneup and call it good.
Nothing wrong with a quadrajet when set up correctly. Try a weiand stealth intake. If you have to have a different carb, keep it under 650 cfm. Watch the carb height when closing the stock small block hood.
generally speaking, too little cfm = good low rpm range, and sacrifice high rpm/power
too large CFM = higher rpm, and sacrifice low rpm/power
Nothing wrong with a quadrajet when set up correctly. Try a weiand stealth intake. If you have to have a different carb, keep it under 650 cfm. Watch the carb height when closing the stock small block hood.
generally speaking, too little cfm = good low rpm range, and sacrifice high rpm/power
too large CFM = higher rpm, and sacrifice low rpm/power
Last edited by builder; Nov 16, 2011 at 12:48 PM.
Safety Car
Joined: Sep 2005
Posts: 4,052
Likes: 97
From: Southeast, Tennessee
St. Jude Donor '09 thru '26
i just replaced the carb on my 78 with the jet performance stage 2 750 cfm carb from summit. the part number there i believe is 35002. it is an exact replacement with reworked innards. made a big difference. the only thing different is that the replacement carb has an electric choke as opposed to the heat rise type choke. the carb is a direct bolt up to the existing manifold. if you wish to change manifolds, why not just consider an aluminum L82 stock type with the carb replacement
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