How do I know which model carb
Thread Starter
Racer
Joined: Aug 2006
Posts: 420
Likes: 0
From: Pampa Texas
How do I know which model carb
Showing my ignorance again here, but I'm trying to learn.
I've had my 75 for several years now, but I just had a 383 built that will be finished this week. It will be in the neighborhood of 430 horsepower, but I don't have any of the specifications in front of me.
The engine builder recommends a Holley 750 double pumper.
I went to purchase a Holley 750 and didn't realize there were that many models. Vacuum secondaries, mechanical secondaries, electric choke, manual choke ect. I admittedly don't know much about all of these things. I learn as I go.
My question is which model do I want/need and an even bigger question why do I want/need that one? I'd like to learn why instead of just saying cause that's what someone told me lol. Thanks in advance for any help.
I've had my 75 for several years now, but I just had a 383 built that will be finished this week. It will be in the neighborhood of 430 horsepower, but I don't have any of the specifications in front of me.
The engine builder recommends a Holley 750 double pumper.
I went to purchase a Holley 750 and didn't realize there were that many models. Vacuum secondaries, mechanical secondaries, electric choke, manual choke ect. I admittedly don't know much about all of these things. I learn as I go.
My question is which model do I want/need and an even bigger question why do I want/need that one? I'd like to learn why instead of just saying cause that's what someone told me lol. Thanks in advance for any help.
Race Director
Joined: May 2006
Posts: 18,735
Likes: 2,582
The Holley 750 double pumper is a mechanical secondary carburetor. I would assume you would want an automatic electric choke. The carburetor below might be a good choice but you dont mention what type of transmission or rear end gears which factor in choosing the correct carburetor. You also dont mention what the projected redline of your engine will be. I arrived at this carburetor by using the carburetor selection screen at the Holley site, link below.
http://www.holley.com/0-76750RD
http://www.holley.com/applications/C...bSelection.asp
http://www.holley.com/0-76750RD
http://www.holley.com/applications/C...bSelection.asp
Last edited by MelWff; Mar 27, 2014 at 01:59 PM.
Thread Starter
Racer
Joined: Aug 2006
Posts: 420
Likes: 0
From: Pampa Texas
Right now the existing engine has an edelbrock performer with a holley 670 street avenger. I'm swapping to a performer rpm. Some say I will have to change the hood some say I will not with the right drop base, I will deal with that when I get there.
As of right now I'm almost certain it has the stock gear ratio of 3.08. Gears will be changed sometime in the next year.
I'm dropping the new engine in over the next month as I get time and it will immediately go to the transmission shop. It has a th400 which will be rebuilt and the engine builder recommends a stall of 2600 to 3000.
Thanks for the link to the carb selector. It doesn't suggest using the double pumper with the gear ratio I currently have. What will the downside be of going ahead and buying and using the 750 double pumper for now and changing gears later?
As of right now I'm almost certain it has the stock gear ratio of 3.08. Gears will be changed sometime in the next year.
I'm dropping the new engine in over the next month as I get time and it will immediately go to the transmission shop. It has a th400 which will be rebuilt and the engine builder recommends a stall of 2600 to 3000.
Thanks for the link to the carb selector. It doesn't suggest using the double pumper with the gear ratio I currently have. What will the downside be of going ahead and buying and using the 750 double pumper for now and changing gears later?
Thread Starter
Racer
Joined: Aug 2006
Posts: 420
Likes: 0
From: Pampa Texas
The existing carb has issues and will have to be rebuilt or replaced either way. From reading it seems 670 will the on the low end of what I need? Is that your thought? I don't mind spending money to get the correct carb, I've had this car too long time to start fixing her up good!
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
The existing carb has issues and will have to be rebuilt or replaced either way. From reading it seems 670 will the on the low end of what I need? Is that your thought? I don't mind spending money to get the correct carb, I've had this car too long time to start fixing her up good!
Scott
Thread Starter
Racer
Joined: Aug 2006
Posts: 420
Likes: 0
From: Pampa Texas
Shooting for middle ground, I'd like to eventually start drag racing the car. Still have gears, half shafts and some of the suspension to do after the engine and transmission. But I'd also like it to be a streetable car. Probably one of those be really good at one or the other or ok at both? Thanks
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: May 2006
Posts: 18,735
Likes: 2,582
Carb Selection
Shooting for middle ground, I'd like to eventually start drag racing the car. Still have gears, half shafts and some of the suspension to do after the engine and transmission. But I'd also like it to be a streetable car. Probably one of those be really good at one or the other or ok at both? Thanks