Carb selection?

[bbcharger71]

hey guys, I'm trying to decide what size carb to go with on my 400. It's a fairly mild motor. The specs are : .060 bore making it roughly a 406, .509/292 purple shaft cam, 440 edelbrock rpm heads, 383 torker RPM intake, and stock steel rockers. It will be mated to a 727.

I've been looking at the Holley street avengers (770cfm or 870cfm). Would that be a good choice and if so which one would beter suit this set up?

 

[Randy73]

Go to Holley's website and use that, I did for both my 383 and 340 and it has worked out good for both.
Though I ended up buying edelbrocks.

 

[bbcharger71]

You can't run a edelbrock on a square bore though can you?

 

[bbcharger71]

I know I've heard horror stories of having to tune Holleys every other day. Are these Street Avengers pretty reliable or will I be under the hood every 100 miles? I found an 870cfm on ebay for 159 bucks that needs a rebuild and I was wondering if it was worth the trouble.

 

[67 B-body]

I know I've heard horror stories of having to tune Holleys every other day. Are these Street Avengers pretty reliable or will I be under the hood every 100 miles? I found an 870cfm on ebay for 159 bucks that needs a rebuild and I was wondering if it was worth the trouble.

Just a wives tale. I love them!

 

[godfatherofchry]

dam somthing must be wrong with sumones tuning I have had a 3310-1 (780) on a car for 9yrs. and havent did any thing to it......Artie

 

[Meep-Meep]

Personally I don't think you need any more than 650-700 CFM. If you want the new Holley I'd go with the 670. I have an Edelbrock 750 on my 440 and it runs great!

 

[rumblefish360]

Whats your stall and gear ratio as well as intended useage?

I'd run a slightly smaller carb for street, a bigger one for the track. IMO, a 750 cfm carb would be best for both.

 

[WileE]

I'd go with Edelbrock 750 Performer electric choke. Easy to jet if you tune it, but they run great out of the box.

 

[Randy73]

I'd go with Edelbrock 750 Performer electric choke. Easy to jet if you tune it, but they run great out of the box.

:3gears: I agree

Holley's seem to be hit or miss, but I like Edelbrock the best. Easy to tune and reliable.

 

[forphorty]

Good old 4779 Holley 750 DP. Very versatile carb. You didn't mention what converter you will be using. That 509 cam really needs a lot of stall in a 383. Anything less than 3000 it will be a dog off the line. Really should have 4000+

 

[bbcharger71]

I havent gotten the converter yet but from my research, a 3500 seems to be the ticket. and rumblefish360, as of now i have a 8 3/4 i got out of a truck that has a 3.23 ratio. This car will be a cruiser with a few stoplight to stoplight runs. I have a cfm app on my iphone that says i should run 750. I just felt like that would be a little small, then again, this is my first big block build.

 

[bbcharger71]

I think I will go with like a 750 or 770. I'm still on the fence between an Edelbrock or Holley. I am running a single plane intake and I want it all to fit under a bulge hood and I would have to get an adapter to run the Edelbrock. Would this be an issue or am I worrying about nothing?