What carb for my engine?
Thread Starter
Intermediate
Joined: Feb 2004
Posts: 33
Likes: 0
From: Parma oh
What carb for my engine?
Greetings all, I'm new to the website. I know this has been ask a lot but I could use some help. I've been trying to do the research on the internet but I'm still not sure what to pick up for my '81. I'm still pretty new to building engines.
Here is the engine info:
Block: 355 4-bolt with flat top pistons, 9.5:1 compression ( I think )
Cam: tfs-k31401001, 228/234 duration, 480/494 lift
Heads: tfs-30400002 23 degree heads / 1.47in springs, 1.5 roller rockers
Intake: I'm looking to pick up a performer rpm air-gap, not worring about hood clearance at this point.
Gears: I plan on putting in 3.55
If you could also recommend a torque convertor I would appreicate. For right now, I still plan on using the old 350c trans. I figure as long as I don't abuse it, it should be ok. Although I'm not really sure how much horsepower/torque the motor will be putting out. I'm a little worried that the trans won't last long. I'm mainly building it for the street but I'd like to run it at the track just to see what the times would be like.
thanks
Here is the engine info:
Block: 355 4-bolt with flat top pistons, 9.5:1 compression ( I think )
Cam: tfs-k31401001, 228/234 duration, 480/494 lift
Heads: tfs-30400002 23 degree heads / 1.47in springs, 1.5 roller rockers
Intake: I'm looking to pick up a performer rpm air-gap, not worring about hood clearance at this point.
Gears: I plan on putting in 3.55
If you could also recommend a torque convertor I would appreicate. For right now, I still plan on using the old 350c trans. I figure as long as I don't abuse it, it should be ok. Although I'm not really sure how much horsepower/torque the motor will be putting out. I'm a little worried that the trans won't last long. I'm mainly building it for the street but I'd like to run it at the track just to see what the times would be like.
thanks
Instructor
Joined: Feb 2004
Posts: 133
Likes: 0
From: Kaysville Utah
Re: What carb for my engine? (Beer)
I've heard nothing but good things about the Speed Demon carburetors. When they are tuned right they really run. For the price it's probably your best bet. I want to get one for my 81
As far as torque convertors go, that all depends on how you drive it. With the 3:55 gears you plan on using I wouldn't get too crazy with a high stall converter if you want the car to be streetable.
As far as torque convertors go, that all depends on how you drive it. With the 3:55 gears you plan on using I wouldn't get too crazy with a high stall converter if you want the car to be streetable.
Drifting
Joined: Jul 2002
Posts: 1,855
Likes: 0
From: Cocoa Beach FL
Re: What carb for my engine? (Beer)
I run a similar setup with a bit more compression (10:1) and the stck 350 bore. I have a Demon 650 with Vac. secondaries and am very happy with it. Great performance out of the box. However, many folks on here would say that you can run a 750 with on problems on a 350 and even more would say that mech. secondaries are the way to go even if you are running an auto.
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Re: What carb for my engine? (Beer)
Your setup sounds pretty close to what I'm running (maybe) see my sig. Anyway, I'm running a 670cfm Holley and love it. BTW, my original QJet is rated at 750cfm. Most folk will agree that a carb in the 650-750 range should be fine. Maybe the lower end of the cfm range is better for more torque and vacuum. :cheers:
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Re: What carb for my engine? (Beer)
You need a 750 mechanical secondary...either Barry Grant or Holley. For TC, try a 2000-2500...but whatever stall you get, you'll prolly want more eventually.
Brett :thumbs:
Brett :thumbs:
Le Mans Master
Joined: Sep 2003
Posts: 7,776
Likes: 0
From: Everywhere
Race Director
Joined: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Re: What carb for my engine? (Beer)
I don't know how you plan on driving your car, but I'd say you're good with a 750 Holley DP. I fugure you could look for a torque converter with an "advertised" stall speed in the 2,400 RPM range.
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: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Re: What carb for my engine? (Beer)
It sounds like I can run a 750 without any problems.
Le Mans Master
Joined: May 2003
Posts: 5,642
Likes: 1
Re: What carb for my engine? (The Dude)
i run a speed demon 650 on my 10.5:1 comp 383... it does awesome.
the people that helped me pick my carb were the engine crew on the boat team I was with. they had a 976 hp 427ci boat that won many many races. I trusted them and am very happy...hopefully i can afford to send to lars soon.
the people that helped me pick my carb were the engine crew on the boat team I was with. they had a 976 hp 427ci boat that won many many races. I trusted them and am very happy...hopefully i can afford to send to lars soon.
6th Gear
Joined: Mar 2004
Posts: 6
Likes: 0
From: Manville NJ
Re: What carb for my engine? (vetteonr)
whats wrong with a Q-jet? they last forever,easy to find,cheap,good for street driving,better on gas then a holley,and best of all it looks real cool on a fast car! i went 10.49 @ 126.50 in a 3200# camaro with 10.5 to 1 comp. and 1.94 valves with a 650 cfm Q-jet. (SS/HA)
Instructor
Joined: Jun 2003
Posts: 101
Likes: 0
From: Ashland Virginia
Re: What carb for my engine? (Beer)
You might want to double check your rear end gear ratio. I've got an '80 model and am going with the 3.54 Dana 44. I don't think that 80 - 82 had the 3.55 option. That was for '79 and below.
Enjoy your Vette!
Old Black Chevy
Enjoy your Vette!
Old Black Chevy
