Choosing a Carb?
Thread Starter
Pro
Joined: Jul 2001
Posts: 704
Likes: 10
From: Blairsville Ga
Choosing a Carb?
I'm having a hard time decided on which carb to get for my vette. The engine is a 355 with the Edelbrock performer rpm top end kit. Right now the car has an old Holley 750 that needs attention. I called summit and they suggest a 600, then I called Edelbrock and they suggested an 800 (wow big difference) Any suggestion I would greatly appreciate it.
Thanks Scott
Thanks Scott
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Typical street 350 is fine w/ 600.
650 will do it for you. Edelbrock just has 2 sizes 600 & 800 so if they want to suggest more than 600 then 800.
This will help.
CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
650 will do it for you. Edelbrock just has 2 sizes 600 & 800 so if they want to suggest more than 600 then 800.
This will help.
CARBS Tests TQ/HP
http://www.corvettefaq.com/c3/carbcomparo.htm
Drifting
Joined: Apr 2007
Posts: 1,892
Likes: 3
From: Springfield Illinois
I believe Edelbrock recommends the 1407 carb. My dad has the same package on his engine with the 1407 carb. The 750's seem to suit the engine well.. The edelbrock carb is not one that you will just be able to throw on out of the box. So personally, I would see if I could get the bugs worked out on holley before I'd consider an edelbrock carb.
Thread Starter
Pro
Joined: Jul 2001
Posts: 704
Likes: 10
From: Blairsville Ga
I'll try to get the 750 working before spending the money but if it's to big of a PIA I'll get a 650 with electric choke. I just thought the 750was way to bid for the package.
Thanks for the post
Thanks for the post
Drifting
Joined: Apr 2007
Posts: 1,892
Likes: 3
From: Springfield Illinois
I'll agree with you.. It does sound big, but when you starting turning this engine past 6500 it seems like the 750 does help. I had an edelbrock 600 for a little while on my mild L82 and it just felt like it was done after about 4000. I stuck an edelbrock 750 or 1407, and it seemed I lost a little low end, but I could definitely tell a much stronger pull at 3000. If I am not mistaken, the LT1's ran a 750 Vacuum sec DP. If you haven't noticed already, the Performer RPM manifold and the LT1 manifold are practically the same design. So in reality what you have is basically an LT1 with a better flowing manifold and bigger cam.
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Race Director
Joined: May 2006
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if there an accelerator pump attachd to both the primary, front, and secondary, rear, float bowls, it's a double pumper. if only the front has an accelerator pump and the rear has a piston like device on the passenger side it's a vacuum secondary. Look at the airhorn front for the list number of the carburetor
Race Director
Joined: May 2007
Posts: 11,331
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From: Out of Site...Out of Mind. Corvette: anything else is just transportation.
St. Jude Donor '09 thru '20
I've got a Barry Grant Street Demon 650 on my '75.
Whatever you decide to go with just remember, know matter what the person over the phone tells you, the d*@m thing is not ready to bolt on and go out of the box.
I know this from experience.
Whatever you decide to go with just remember, know matter what the person over the phone tells you, the d*@m thing is not ready to bolt on and go out of the box.
I know this from experience.
Burning Brakes
Joined: May 2006
Posts: 774
Likes: 1
From: Round Rock Texas
Amen. I went through 3 jet sizes before getting where I needed to be on my BG 750 Speed Demon. But, the Holley and the Barry Grant are better carbs than the Edelbrock. I went through a couple of those and they were lacking low end response. I also stuck an Edelbrock AirGap RPM. Very responsive combo.
Race Director
Joined: May 2007
Posts: 11,331
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From: Out of Site...Out of Mind. Corvette: anything else is just transportation.
St. Jude Donor '09 thru '20
Got one more thing to add.
You may have to search for an air filter unit that'll fit/clear. My stock air filter base wouldn't fit down on the BG carb. The chrome ignition shield hit it. Had no problem with the Q-jet and the shield. Just a slight difference in position and....... think I found one that'll work.... I hope.
You may have to search for an air filter unit that'll fit/clear. My stock air filter base wouldn't fit down on the BG carb. The chrome ignition shield hit it. Had no problem with the Q-jet and the shield. Just a slight difference in position and....... think I found one that'll work.... I hope.
Burning Brakes
Joined: Jan 2003
Posts: 755
Likes: 32
From: Roswell Georgia
I've found that the Holley Technical Library to be a great source of information and recommend it highly.
I use the carburetor cleaner and dipping basket from NAPA on all my Holley carbs. The stuff works well and cleans up with water; however, you may already have a preferred cleaning solution.
Good luck with the rebuild!
Advanced
Joined: Apr 2008
Posts: 71
Likes: 0
Mr. Beachcomber is right. Throw a HOLLEY rebuild kit at your 750. Basically you'll want to replace the gaskets and the needle and seat assemblies. I find the carb dips to be overkill unless your carb is really grungy and they are hard on plastic parts. Since your carb is a running carb all you probably need is a couple pans of kerosene, a can of carb cleaner and some compressed air. Cleanliness is the key! 750 cfm is fine for your motor. Set the floats right, get it jetted correctly, and set your idle mixture screws with a vacuum gage and you'll be good to go. If you feel you need more tune ability put a 4150 metering block kit on the secondary side.
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
Mr. Beachcomber is right. Throw a HOLLEY rebuild kit at your 750. Basically you'll want to replace the gaskets and the needle and seat assemblies. I find the carb dips to be overkill unless your carb is really grungy and they are hard on plastic parts. Since your carb is a running carb all you probably need is a couple pans of kerosene, a can of carb cleaner and some compressed air. Cleanliness is the key! 750 cfm is fine for your motor. Set the floats right, get it jetted correctly, and set your idle mixture screws with a vacuum gage and you'll be good to go. If you feel you need more tune ability put a 4150 metering block kit on the secondary side.
You have the best carb for your application....and it's easy to rebuild and tune! 
