Carb reccomendations for my application
#1
Supreme Member
Thread Starter
Join Date: Sep 2001
Location: Decatur, Illinois
Posts: 2,906
Likes: 0
Received 0 Likes
on
0 Posts
Carb reccomendations for my application
Ok, I currently have an 85 T/A. I have a 350 w/ ported 416 heads and ported stock alum intake. I have comp cams xe268 cam. I have hooker long tubes and true duals w/ dynomax bullets. I have a 93 close ratio t56 w/ 2.97 first gear and 3.45 borg warner rear end.
I have a set of world products sportsman II's and a performer rpm intake that I will be porting once I get the time. the motor will probably stay like that for a while. I had origionally planned on just going with the computer controlled quadrajet and still might, but if I do will probably buy a remanufactured one. Mine runs pretty good, but it has some wear on it. I have also considered going with an aftermarket carb but want to keep as much fuel mileage as possible so havent decided.
After I had all of the above mentioned finnished I have been considering saving up and making it a 383 and maybe going up a size or 2 on the cam but that would be a while. If I was to do this would I be able to use the same carb or would I have to change at this point? I also plan to evenutally get a steeper set of gears maybe 3.73's or 4.10's.
I am kind of just going throug the car as I have the money so I am just trying to figure out what I should do when I get the heads and intake ready to go on.
Thanks
Ben
I have a set of world products sportsman II's and a performer rpm intake that I will be porting once I get the time. the motor will probably stay like that for a while. I had origionally planned on just going with the computer controlled quadrajet and still might, but if I do will probably buy a remanufactured one. Mine runs pretty good, but it has some wear on it. I have also considered going with an aftermarket carb but want to keep as much fuel mileage as possible so havent decided.
After I had all of the above mentioned finnished I have been considering saving up and making it a 383 and maybe going up a size or 2 on the cam but that would be a while. If I was to do this would I be able to use the same carb or would I have to change at this point? I also plan to evenutally get a steeper set of gears maybe 3.73's or 4.10's.
I am kind of just going throug the car as I have the money so I am just trying to figure out what I should do when I get the heads and intake ready to go on.
Thanks
Ben
#2
Supreme Member
Join Date: Jul 2001
Location: New Palestine, IN (Just East of Indy)
Posts: 1,766
Likes: 0
Received 2 Likes
on
2 Posts
Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
I think a Holley 750 DP would do nicely, but if you're looking for good gas mileage you might go with a VS carb. The 750 will be plenty, even for the 383 in the future, you'll just have to jet it up some. I wouldn'tgo much bigger than the 274 cam unless it's going to be a strip car, the 284 is pretty big for the street (not to mention gas mileage goes way down). With the 274 I'd go with the 3.73 gears. 4.10's would be a bit much, besides with the 383 oyu have plenty of low end to pull the shorter gear.
#4
Supreme Member
Thread Starter
Join Date: Sep 2001
Location: Decatur, Illinois
Posts: 2,906
Likes: 0
Received 0 Likes
on
0 Posts
So a 750 DP seems to be the consensus? How much difference in fuel mileage will I notice between a vacuum secondary carb and a dp? How much performance?
Ben
Ben
#5
Supreme Member
Join Date: Jul 2001
Location: New Palestine, IN (Just East of Indy)
Posts: 1,766
Likes: 0
Received 2 Likes
on
2 Posts
Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
It wouldn't be a huge difference in mileage, but performance wise would be enough to notice. It won't launch as hard out of the hole with the VS carb, especially since you're running a manual.
#6
Supreme Member
Thread Starter
Join Date: Sep 2001
Location: Decatur, Illinois
Posts: 2,906
Likes: 0
Received 0 Likes
on
0 Posts
So would the 4150 be the what you guys reccomend? I want to at least have the electric choke. Can you buy it with it or do you have to change it out? Would I be best off saving up and getting a new one or do you think that I could buy a used one and be fine?
Ben
Ben
#7
Supreme Member
Join Date: Jul 2001
Location: New Palestine, IN (Just East of Indy)
Posts: 1,766
Likes: 0
Received 2 Likes
on
2 Posts
Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
The 4150 doesn't come with a choke. You'll probably want the 4779 or 3310 (I think it's 3310). Those come with a choke. As long as the carb isn't in bad shape I'd buy a used one. Rebuilding it isn't very hard, and while you're in there you can get some trick parts for it (Adjust-a-jet, buna gaskets, etc.)
Trending Topics
#8
Supreme Member
Thread Starter
Join Date: Sep 2001
Location: Decatur, Illinois
Posts: 2,906
Likes: 0
Received 0 Likes
on
0 Posts
I am pretty sure that the 3310 is a vs carb. I think its what is on my brothers car. I am going to look up the numbers you posted though. I thought that the 4150 had a manual choke at least?
Ben
Ben
#9
Supreme Member
Thread Starter
Join Date: Sep 2001
Location: Decatur, Illinois
Posts: 2,906
Likes: 0
Received 0 Likes
on
0 Posts
http://store.summitracing.com/partde...LY%2D0%2D4779C This is the 4150 and it says that it has a manual choke. I checked and the 3310 is vs. It also appears that the 4779 is the 750 cfm 4150. So what I would want is the 4779/4150.
#10
Member
Join Date: Jan 2001
Location: Jacksonville, FL, USA
Posts: 319
Likes: 0
Received 1 Like
on
1 Post
Car: 1988 Firebird
Engine: GM Performance Parts 350 HO
Transmission: T56
Axle/Gears: :(
DP/4150 carbs come with a manual choke but you can buy a Holley electric choke kit from Summit for about $40.
#11
Supreme Member
Join Date: Jul 2001
Location: New Palestine, IN (Just East of Indy)
Posts: 1,766
Likes: 0
Received 2 Likes
on
2 Posts
Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
Sorry, I was thinking the 4150 HP ones, those don't have a choke. I don't know where the 3310 number came from, I must have been thinking of something else. The 4779 would be what you want.
#12
Senior Member
Join Date: May 2001
Location: springfield,IL
Posts: 745
Likes: 0
Received 0 Likes
on
0 Posts
Car: T/A / Grand Am
Engine: 383 SBC
Transmission: glide
Axle/Gears: 9" ford 5.67
Ben, DON"T buy a rebuilt Qjet. If you still want to use the ccQjet take yours to a carb shop, and have them do it. Most rebuilders ruin those Qjet in the process. They use generic and inferior parts, not intended for performance.
Thread
Thread Starter
Forum
Replies
Last Post
2012sergen11
Engine/Drivetrain/Suspension Wanted
6
10-13-2015 07:38 PM
Damon
Tech / General Engine
8
09-26-2015 04:29 PM