Which carb should I get????????????
3rd Gear Member
Joined: Aug 2007
Posts: 572
From:
get a speed demon 575 annular carb OR booger look at the new summit carbs, good price, improved holley 4010 design (like the autolite 4100) annular venturi's and did I say great price........but you cant beat a demon for the money and you can get remans on ebay for a great price as well, I have bought 3 so far and they worked perfect right out of the box. I went and bought a prosystems custom made to my combo for my 408, it cost me well over 700 bucks, it didnt un as good except WOT than my reman out of the box speed demon 650, I bought a reman mighty demon annular for under 500.00 and it ran perfect. I have since installed a WB air fuel meter and to my surprise the 750 runs almost perfect A/F ratio everywhere untouched right out of the box on my custom 500hp 408.
Last edited by htwheelz67; May 1, 2009 at 02:03 AM.
6th Gear Member
Joined: Apr 2007
Posts: 10,468
From: California
Don't use 2 carburetor gaskets, it's more likely to develop a vacuum leak that way. You can run lean and burn valves using a "mechanic's trick" like that. If it won't seal with 1 gasket, then find the problem and fix it.
Joined: Jan 2009
Posts: 30
From: Arkansas
I love the holley Street avenger series. I have a 770 cfm street avenger on my cleveland. i had a 750 edelbrock on the engine before and that thing ran like crap and choked off about halfway through the powerband. that holley on the otherhand has make my car run like a scolled ape on steroids. Granted it is hard to tune one at times but right out of the box its pretty close to where you need it. and i had more problems with leaks from my edelbrock than my holley.
Id say go with a 670 alluminum street avenger which is lighter and runs just as great!
Id say go with a 670 alluminum street avenger which is lighter and runs just as great!
6th Gear Member
Joined: Oct 2006
Posts: 6,417
From: Cork, Ireland
I love the holley Street avenger series. I have a 770 cfm street avenger on my cleveland. i had a 750 edelbrock on the engine before and that thing ran like crap and choked off about halfway through the powerband. that holley on the otherhand has make my car run like a scolled ape on steroids. Granted it is hard to tune one at times but right out of the box its pretty close to where you need it. and i had more problems with leaks from my edelbrock than my holley.
Id say go with a 670 alluminum street avenger which is lighter and runs just as great!
Id say go with a 670 alluminum street avenger which is lighter and runs just as great!
4th Gear Member
Joined: Sep 2008
Posts: 1,839
From: Connecticut
Let's stir the pot!!!!
When I built this FFR Daytona Coupe, I went from EFI to Edelbrock 750 carb to a Holley 750 4150HP carb:
It has a Ford Racing 430HP 392 (stroked 351w). The first induction system was this EFI stack system:
By virtue of the design, stack systems must use speed density. There is a common vacuum plenum under the manifold that feeds the vacuum signal to the sensor in the ECU. Properly tuned, this set up made 316HP at the rear wheels, but had amazing seat of the pants feel from idle to about 4000 rpm. My theory is that it choked at higher RPM due to the individual runner design inherent in a stack system. However, according to my Gtech, it did 0 to 60 in 3.8 seconds (the car only weighs 2300 lbs).
After running it that way for 1 1/2 years, I swapped it for a torker 2 and an Edelbrock 750 carb. I had to use the Torker 2 for hood clearance and I wanted to try out the Edelbrock carb. BTW, this is the carb a donated to Joe67 for his Mustang recently. The carb was easier to tune, but lost some of that seat of the pants pop and I know it was well tuned. My 0 to 60 times dropped to 4.1 seconds, but I got them back to 3.9 by keeping the rpms up through the gears. I did not have this set up on the dyno, however, the Edelbrock was a fine carb for most driving. I did notice that it would bog on hard cornering or hard braking and tended to lean out a bit at rpms above 5000. However, they don't leak and are great carbs for moderate performance on a production car. The coupe was set up for handling and performance. It pulled over 1.1g on the skid pad as tested by FFR (not my car, theirs) and is a brute with the 315/35-17 tires (mine).
I then installed the Holley 750 cfm (4150HP) number 0-82751. This one to be exact:
The difference was significant. Once tuned and yes it was more difficult to tune than the Edelbrock, it was amazing. The seat of the pants feel at lower rpm was about the same, but from 2,500 to 6,000 the car was amazing! My best 0 t0 60 time via the Gtech was 3.6 seconds. On the dyno, the rear wheel HP was 328HP!
The bottom line is that a mass flow type EFI will kick a carb in almost every kind of driving and deliver great fuel economy. For old school look and performance, nothing beats a well tuned Holley or Holley clone (they did choose to clone the Holley for a reason)!
When I built this FFR Daytona Coupe, I went from EFI to Edelbrock 750 carb to a Holley 750 4150HP carb:
It has a Ford Racing 430HP 392 (stroked 351w). The first induction system was this EFI stack system:
By virtue of the design, stack systems must use speed density. There is a common vacuum plenum under the manifold that feeds the vacuum signal to the sensor in the ECU. Properly tuned, this set up made 316HP at the rear wheels, but had amazing seat of the pants feel from idle to about 4000 rpm. My theory is that it choked at higher RPM due to the individual runner design inherent in a stack system. However, according to my Gtech, it did 0 to 60 in 3.8 seconds (the car only weighs 2300 lbs).
After running it that way for 1 1/2 years, I swapped it for a torker 2 and an Edelbrock 750 carb. I had to use the Torker 2 for hood clearance and I wanted to try out the Edelbrock carb. BTW, this is the carb a donated to Joe67 for his Mustang recently. The carb was easier to tune, but lost some of that seat of the pants pop and I know it was well tuned. My 0 to 60 times dropped to 4.1 seconds, but I got them back to 3.9 by keeping the rpms up through the gears. I did not have this set up on the dyno, however, the Edelbrock was a fine carb for most driving. I did notice that it would bog on hard cornering or hard braking and tended to lean out a bit at rpms above 5000. However, they don't leak and are great carbs for moderate performance on a production car. The coupe was set up for handling and performance. It pulled over 1.1g on the skid pad as tested by FFR (not my car, theirs) and is a brute with the 315/35-17 tires (mine).
I then installed the Holley 750 cfm (4150HP) number 0-82751. This one to be exact:
The difference was significant. Once tuned and yes it was more difficult to tune than the Edelbrock, it was amazing. The seat of the pants feel at lower rpm was about the same, but from 2,500 to 6,000 the car was amazing! My best 0 t0 60 time via the Gtech was 3.6 seconds. On the dyno, the rear wheel HP was 328HP!
The bottom line is that a mass flow type EFI will kick a carb in almost every kind of driving and deliver great fuel economy. For old school look and performance, nothing beats a well tuned Holley or Holley clone (they did choose to clone the Holley for a reason)!
Last edited by fakesnakes; May 1, 2009 at 02:51 PM.
6th Gear Member
Joined: Oct 2006
Posts: 6,417
From: Cork, Ireland
nice writeup. I never thought you can have a drivetrain loss of 25% with manual gears ( i guess this GT40 is not an auto ...). don't forget to mention the pricetag of that 4150HP. close to 500$ and an Edelbrock 1411 is 300 ;-)