More carb horse
Thread Starter
4th Gear
Joined: May 2024
Posts: 4
Likes: 0
More carb horse
I'm new here, I have a 68 327 with a quadrajet.
I'm looking to get more power so I'm thinking a better carb is a good start. I've seen the Holley Snipers and Demon carbs but wonders what's the highest recommended setup first time, so I don't have to keep guessing and trying new stuff.
Would I need the choke or divorce choke, not sure which way to go on that and why?
Thanks for any advice.
I'm looking to get more power so I'm thinking a better carb is a good start. I've seen the Holley Snipers and Demon carbs but wonders what's the highest recommended setup first time, so I don't have to keep guessing and trying new stuff.
Would I need the choke or divorce choke, not sure which way to go on that and why?
Thanks for any advice.
Le Mans Master
Joined: Jun 2019
Posts: 7,658
Likes: 2,470
From: Indiana
not sure if that is the low hanging fruit is carb.. maybe focus on ignition timing and exhaust first.
maybe consider below as well
https://www.corvetteforum.com/forums...d-to-lars.html
maybe consider below as well
https://www.corvetteforum.com/forums...d-to-lars.html
Melting Slicks
Joined: Apr 2021
Posts: 2,716
Likes: 2,163
From: Minnesota
I agree with the posts above. If your engine is stock or even modified a well set up Quadrajet should have more than enough CFM capability to supply a 327.
Have any other modifications been made to the engine?
Have any other modifications been made to the engine?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Your Q-Jet carb is not the 'power' restriction for your engine. It can flow 750cfm which is MUCH more that your stock engine can use. Put your money where it will do some good. Heads/cam/exhaust is where the power is made (if you don't want a full engine rebuild).
P.S. You should make sure that the carb secondaries are fully opening when the accelerator pedal is pushed to the floor. Also verify that the secondary lockout lever on the Q-Jet is releasing properly when choke is warmed up. Next improvement is to re-curve your distributor for maximum performance. Do these things first...BEFORE you start throwing money at more HP.
P.S. You should make sure that the carb secondaries are fully opening when the accelerator pedal is pushed to the floor. Also verify that the secondary lockout lever on the Q-Jet is releasing properly when choke is warmed up. Next improvement is to re-curve your distributor for maximum performance. Do these things first...BEFORE you start throwing money at more HP.
Melting Slicks
Joined: Apr 2021
Posts: 2,716
Likes: 2,163
From: Minnesota
There’s also late 70’s Chevy and early 70’s Pontiac carbs that are rated for 800 CFM…
But those ones tend to test on a flow bench closer to 890 CFM.
Plus there’s those “new” ones that are only rated at 600 CFM.
Also there’s those Edelbrock ones that are rated at 850 CFM.
It’s all so confusing
Last edited by Piersonpie; May 23, 2024 at 07:47 AM.
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Thread Starter
4th Gear
Joined: May 2024
Posts: 4
Likes: 0
To answer all of your question in one place.
It's a stock 327 1968 Corvette with stock quadrajet.
No modifications to the engine that I know of.
The reason I was looking to replace the carb is because it needs a complete rebuild. In efforts to keep it matching numbers, I guess I'll just have it rebuilt.
I believe the exhaust are straight. No cats, no muffler, 2¹/² round. Would love some hookers with sidepipes but don't like toasted calves.
It's a stock 327 1968 Corvette with stock quadrajet.
No modifications to the engine that I know of.
The reason I was looking to replace the carb is because it needs a complete rebuild. In efforts to keep it matching numbers, I guess I'll just have it rebuilt.
I believe the exhaust are straight. No cats, no muffler, 2¹/² round. Would love some hookers with sidepipes but don't like toasted calves.
Last edited by Shawkrider; May 22, 2024 at 09:58 PM.
Race Director
Joined: Mar 2017
Posts: 11,953
Likes: 4,510
From: Virginia
If you have it rebuilt, have it rebuilt by @lars
Otherwise, buy Cliff Ruggles' book and rebuild kit and DIY
https://cliffshighperformance.com/pr...category/books
Otherwise, buy Cliff Ruggles' book and rebuild kit and DIY
https://cliffshighperformance.com/pr...category/books
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Shawkrider,
Its a little more to it than waiting for UPS to bring you a new Holley. (if you go that route)
Right out of the box, the Holley will run very well. Unfortunately, not on your stock Intake.
You have the spread-bore bolt pattern.
Holley is square-bore.
So, that is why the Edelbrock 2101 Performer is so popular with our Vettes. It's a spread-bore and a square-bore pattern.
But wait! There's more. It fits under the hood too.
Its a little more to it than waiting for UPS to bring you a new Holley. (if you go that route)
Right out of the box, the Holley will run very well. Unfortunately, not on your stock Intake.
You have the spread-bore bolt pattern.
Holley is square-bore.
So, that is why the Edelbrock 2101 Performer is so popular with our Vettes. It's a spread-bore and a square-bore pattern.
But wait! There's more. It fits under the hood too.