looking for advice on a carb

mustangmike6996 · Mar 8, 2012

im building a 331 stroker. perf rpm heads with 2.02 intake valves. perf rpm intake. mild/large cam.

what CFM do you guys recommend? i have heard anything from 550-700 cfm.

also im looking at holley street avenger. how are they? i know the double pumpers were all the talk a long time ago.

i dont like edelbrock style because they are based off of a rochester quadrajet (which arent that good)

ihadagt500 · Mar 8, 2012

You may not like Edelbrocks because they are based on a Carter AFB, not a Q-jet, which is probably the best carb ever produced. No float bowls to leak, no metering blocks to warp and no rubber power valves to rupture. GM used them very successfully from 1966 until fuel injection came along. They are very tuneable and they even worked quite well on 1970 429 CJ's

The_Dude · Mar 8, 2012

Get a 650, mechanical secondaries if you have a manual transmission, or vacuum secondaries if you have an automatic transmission.

Falcon79 · Mar 9, 2012

Get a 650, mechanical secondaries if you have a manual transmission, or vacuum secondaries if you have an automatic transmission.

Agreed. Although I would like to also defend my edelbrock 1406 and say it has been more dependable and required less tuning than my old Holley ever did.

WTFO · Mar 9, 2012

The_Dude said:
Get a 650, mechanical secondaries if you have a manual transmission, or vacuum secondaries if you have an automatic transmission.

+1
What are you building the engine for? Street? Drag? Autocross? Check what carb Nascar used up to the fuel injection coming in. Holley. Not Carters. Not Q-junk. How you plan to use the car is the deciding factor of which carb to buy.

rbohm · Mar 9, 2012

personally i very much like the edelbrock carbs. a friend of mine and is have used them almost exclusively for years now and they have all been quite reliable, even when they are on cars not used much. not so with holleys. i would use a 1406 edelbrock on your build. it is a 600 cfm carb that does quite well on a variety of combinations. so far the only engine we have used the 1406 on that hurt engine performance was on a 454 chevy making about 450hp.

gikort · Mar 9, 2012

I don't have any experience with the Street Avenger, but I have had good luck with the regular 4160 600 cfm w/ vacuum sec on a 302, and I have a 4150 600 double pumper on my '67 306. It screams. I would not use anything else. I have had this carb on the car for about 7 years and have never had to adjust it. I only drive the car in the summer, so even sitting 6-8 months a year hasn't been a problem. Holley all the way. I'm sure the Street Avenger would work great. 600-650 cfm.

Wicked65 · Mar 9, 2012

Alex @ Money Maker Racing. Tell him Greg in California Sent you.
219-861-1214

mustangmike6996 · Mar 9, 2012

im not looking to race every weekend but i am not opposed to running its down the track a few times. itll be mostly stop light to stop light. would 600cfm be enough? i keep hearing ppl running 650 or so on 331's

Bullitt347 · Mar 9, 2012

If going with a Holley style carb, I would go with one by Quick Fuel. Out of the box one of the best carbs you can get. And for a 331 cid small block I would go with a 750 cfm carb. A 600 would leave HP on the table. It is all about getting the air/fuel right. I can make that 331 run good on a 250 cfm 1bbl. carb or make it run good on a 1100 cfm Dominator. The HP difference between the two carbs would be huge, but they would work, no bog or anything. If the air bleeds are right and it is jetted right the size does not matter. If this is a fuel economy build (and with those heads and intake it will not be) then a 600 cfm would work just as well.

mustangmike6996 · Mar 9, 2012

i am not looking for economy as much as hp. 750 sounds like it'll help put down some power tho

WTFO · Mar 9, 2012

+1 on the Quick Fuel. My buddies Falcon runs a Race Q on his 347. Those guys dropped what they were doing to help us in Bowling Green last year. Great carb and good people.

mustangmike6996 · Mar 9, 2012

i see there are a TON of Race q carb options. which one would work the best? so far im looking for 750 cfm mechanical secondaries.

the ss750 doesnt look too bad. its right about 500 bucks

mustangmike6996 · Mar 9, 2012

how are the 750 cfm speed demons? they are about the same price as the quick fuel.

Monty_Brown · Mar 9, 2012

mustangmike6996 said:
im building a 331 stroker. perf rpm heads with 2.02 intake valves. perf rpm intake. mild/large cam.

what CFM do you guys recommend? i have heard anything from 550-700 cfm.

also im looking at holley street avenger. how are they? i know the double pumpers were all the talk a long time ago.

i dont like edelbrock style because they are based off of a rochester quadrajet (which arent that good)

I have the same motor I'm running a Demon 650dp with 3:70 gears and a t-5

WTFO · Mar 10, 2012

mustangmike6996 said:
i see there are a TON of Race q carb options. which one would work the best? so far im looking for 750 cfm mechanical secondaries.

the ss750 doesnt look too bad. its right about 500 bucks

Again I'd say it's more about how you're going to drive the car. My buddy's Falcon although fully licensed, working lights, full interior, etc.- it's more a race car. 8 point cage, 4000 stall, 4:10 spool, M/T slicks. His Race Q doesn't have a vacuum port or a choke horn so daily driving isn't really an option. You have to look at the full range of what features you need and how convenient you need it to be. If you want to have maximum tuning ability, stick with a Holley style carb. If you want the ultimate in part quality and precision, stick with a Quick Fuel. It's a night and day difference.

mtaqua · Mar 11, 2012

if you are going to spend the money on a speed demon, quick fuel, or other race type carb, look at one of the companies that builds carbs to suit the application. I used prosystems, ran great out of the box. Patrick was very good with customer service also. Also, as mention earlier you can call Alex, and he'll be able to pick a carb for you.

The_Dude · Mar 11, 2012

This one might be a pretty good deal.
http://forums.vintage-mustang.com/e...e/641040-650-speed-demon-f-s.html#post4226597

mustangmike6996 · Mar 12, 2012

The_Dude said:
This one might be a pretty good deal.
http://forums.vintage-mustang.com/e...e/641040-650-speed-demon-f-s.html#post4226597

it would be but there is no provision for a choke. hmmm its pretty tempting tho

The_Dude · Mar 12, 2012

mustangmike6996 said:
it would be but there is no provision for a choke. hmmm its pretty tempting tho

He didn't really word that correctly. It does have the choke horn and mount, it's just missing the choke kit. I have a couple of Demons just like that. I think Jegs still has the choke kits. It looks like he sold it anyway.

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