2bbl to 4bbl

All you really need is any type of 4 barrel manifold from standard to highrise. ( whatever your fancy and power needs)
A 600 Holley is what I use and found it to be good for an all round carby.
No need to mess with valves at all.

Ditto what Tony 64 says. I went with a high rise (Edelbrock Torker) manifold on my first go-round on my '66, and had to deal with hood clearance problems. I now have an Edelbrock dual-plane. Most folks also do headers, and changing the rear end gearing can do a lot to improve hole shots. My '66 came with 2.80 gears, and had the problem you describe.

4 barrel dual plane intake, 600 cam carb. Mild cam. And exhaust will do wonders for it. Don't know what your gears are, but a small change can go a long ways. Even going up to a 3:23 ratio will wake it up considerably.


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Thanks for the advice guys. Here's what I have decided to do....1. Ordered and got a aluminum 4bbl intake from JEGS (Edlebrock) Dual plain. Ordering an Edlebrock 600 CFM 4BBL carb with vac secondary. After it's installed, gonna have it vacuum tuned at the local speed shop. Not gonna mess with cam or vavles just yet as they are all new with less than 100 miles on them. If I don't get the results I am looking for outta my 2.83:1 gears, I'll change them too. This was originally a I6 car so.....

Edelbrocks are mechanical secondary carburetors.

You may want to consider something smaller than 600 CFM!!:|

I had a 650 CFM Holley "Street Avenger" on a 306 SBF and it was a bit large makin' low end performance fairly poor....I wished I had gotten a 500 CFM but sold the car before I got around to it!!:wink:

Good Luck!!thumbsup3.gif

Hi,

Stang 68 said:

... it has a 2bbl carb and produces crappy power.l

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what do you mean by crappy power? Overall, or at any specific situation?
Couple of month after I rebuild my 302 I went from 2bbl to 4bbl. I chose the weiand street warrior intake and an original autolite 4100 (480 cfm) from ebay.
While rebuilding, we put the edelbrock performer cam in it. Since I got this car, all the performance modifications I did to this car were mainly for a torque "monster" in mind. Just what you need off stop lights.
what transmission to you got? Automatic or manual?
another easy modification that can help you alot - electric ignition (like PerTronix). Do you got that already?

Stang 68 said:

I am looking for outta my 2.83:1 gears, I'll change them too. This was originally a I6 car so.....

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If you are going to embark on this task or pay someone to do it, I'll recommend you to go posi. I went up to 3:80 and bought a monkey grip trak lock unit best thing i ever did. I probably could've gone 4:10 on the gears with my AOD but i'm happy with my set up as of now.



J

Stang 68 said:

Thanks for the advice guys. Here's what I have decided to do....1. Ordered and got a aluminum 4bbl intake from JEGS (Edlebrock) Dual plain. Ordering an Edlebrock 600 CFM 4BBL carb with vac secondary. After it's installed, gonna have it vacuum tuned at the local speed shop. Not gonna mess with cam or vavles just yet as they are all new with less than 100 miles on them. If I don't get the results I am looking for outta my 2.83:1 gears, I'll change them too. This was originally a I6 car so.....

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You don't need to do anything with valves period. For a quiet 289 I would have gone with something smaller for carb, like a 500-570. You might get a little better throttle response, or else jet the 600 you got down.

You'll notice the most response from changing out your rear.


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I havent bought a carb just yet,,,,perhaps a 550 Holley? The 289 already has headers. It has an automatic transmission and wont spin the tires....crappy

Stang 68 said:

I havent bought a carb just yet,,,,perhaps a 550 Holley? The 289 already has headers. It has an automatic transmission and wont spin the tires....crappy

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IMHO...do your CFM calcs !!!!!!!!! you will be surprised that depending on the carb model, you can get away with as little as a 390 or 450 cfm unit....they are used in racing circuits all the time!

Stang 68 said:

I havent bought a carb just yet,,,,perhaps a 550 Holley? The 289 already has headers. It has an automatic transmission and wont spin the tires....crappy

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Or lower. If you use Summit's calculator it will tell you 355 CFM is optimal for street.

https://www.summitracing.com/expertadviceandnews/calcsandtools/cfm-calculator

Bigger isn't better for carbs, and can hurt your low end performance (which is what makes your tires spin).