4bbl on a 289?

[LittleFriend]

What size 4bbl would do well on a 289 bored .030 over with a mild cam for street use. And are there any good after market intakes that adapt to the stock heads?

 

[gunmetal5.0]

Hi I have a stock blocked 302 which don't quote me on this is pretty much the same deal as a 289. Or at least the parts seem to be interchangeable. I'm running a weiand aluminum 4v intake manifold and a holley 600cfm carb and holley fuel pressure regulator on the street. This is a simple, reliable setup. I've heard 600cfm is the ideal size for street use. Good luck.

 

[The Great Oak]

I have a 289 thats .030 over, way to big cam, Performer RPM intake, long tubes and an edelbrock (spelling?) 600 cfm 4 barrel carb and it run awesome!

 

[67 GTA]

Mild 289 in my fastback with Edelbrock 600cfm and Wieand stealth intake runs like a top.

 

[gunmetal5.0]

All 600's. I think you have your answer.

 

[ratio411]

570-600 cfm vacuum secondary Holley IMO.
Wieand Stealth is a great all around intake.


Gotta have headers.
You got headers?

 

[65ShelbyClone]

A few Mustangs ago I had a '65 notchback with a 289 and a Weiand X-Celerator topped with a Holley 600 double pumper. It worked pretty well with the mild ~.470"-something cam I was using.

Now I'm using an X-Celerator with a bigger Crane 2031 and Holley 650 DP with aluminum heads and it's even better!

 

[rbohm]

depending on what cam you plan on using, a carb in the 500-600 cfm range is ideal. if you keep the lift below .470, and the net duration below 214 degrees, then i say go with a 500 cfm carb. at or above those numbers on the cam then go with a 600 cfm carb. for the street you want the best throttle response you can get, so smaller on the carb is better.

 

[65FBE2]

Its a proven fact that the 289 4V motor made more hp with the Autolite 470cfm than it did with the popular Holley 600 swap. rbohm is right on the money!

 

[ratio411]

Its a proven fact that the 289 4V motor made more hp with the Autolite 470cfm than it did with the popular Holley 600 swap. rbohm is right on the money!

What?!?
Did you read any of the posts, including the one you reference?!?

 

[LittleFriend]

thanks for the info.

 

[rbohm]

Its a proven fact that the 289 4V motor made more hp with the Autolite 470cfm than it did with the popular Holley 600 swap. rbohm is right on the money!

dont forget that he wants to upgrade his cam. if he keeps it small enough then a 4100 autolite is fine, but with my last 289 i wish i had a 600 cfm carb as it would have had a much better power curve.