HI All,

This is my car:

383, afr 190 heads, 10.0 compression, rpm manifold, holley 3310 carb, cc 282 hydro roller (236/240 @ .050 5.10/5.20 lift) supercomp 1 5/8 headers, 700-R4, 2200 stall, 3.73 rear posi.

68 camaro 3400 lbs with driver, street tires/ sometimes drag radials.

I drive the car on the street mostly, however I drive it fairly hard.


I am leaning towards a carb that is between 650 and 700 cfm. I would like an electric choke (or option for one) and the ability to tune the secondarys.

Any suggestions on brand/size for a high performance street crusier??

thanks
Danb

Nice combo.I think you could use a bit more stall.Wile not necessary a 2800 would be sweet.

Carb,hummm.
Light weight,medium cubes,great heads,good cam,good intake,and good gearing.

Hell dude I wouldn't hesitate on a slightly larger carb.650DP's work GREAT with cams with durations of 224 at .050 and lower.
A 700DP-750DP Holley would be very nice for your combo.You could also go with a 750VS if you are looking for a little mileage :rolleyes:

Don't fall for the old "on the street a VS carb is the best thing since butter on toast" :rolleyes:
I have had my share of both DP's and VS Holleys on street cars.I still prefur a DP hands down.When a DP is properly sized and tuned it will have the responce that a VS can't touch :D

If you don't want to tune the carb get a Edelbrock and be done with it.

I'd go with a Holley 750DP myself.

Whats wrong with your 3310? The correct secondary spring for your combo and the addition of a rear metering block is all you need to tune the secondary side.However,the 4779/750 double pumper also gets my vote..I've run both,and IMHO and experience,they both work well..the DP just makes it easier to fry the tires on the street :D

With the 2200 stall and overdrive I would think that a vac secondary carb would perform better than a DP carb on the street --- and your Holley O-3310 is a good choice IMO.

If you are going after a smaller carb for more throttle response, the a Q-jet would be my choice. The smaller primaries will help with the low RPM, and the big secondaries will provide enough air for your pretty stout combo.

A Holley/Demon Double Pumper might make a little more HP, but will be harder to tune unless you go small like a 650. But IMO a 650 will cost you some power up top. A 750 DP would work best for max power but will be difficult to tune for the street with your tight converter and OD trans.

Just my opinion.


BUT with a lot of

My 3310 was purchased from a friend. It has been messed with. It has had air bleeds drilled, butterflies drilled and then filled, so many mods that I don't know where normal is. It does have a secondary meetering block, quick change etc. It also has heli coils in all the bolt holes and the bolts keep coming loose. The choke tower has been milled off. Now it seems to run very rich at idle, very lean at cruise and rich under acceleration.

I looked into efi, but I don't think I would have the time, patients, or ability to tune it.

Sooo, I think it is time for a new carb. I never even considered a double pumper, I guess old habits die hard. A choke would be nice to have, but is not mandatory, I don't drive the car in extream cold. If you were to purchase a 750 double pump holley for this car, what part number would you consider.

Thanks for your opinions, ideas and experiance.

Danb

For an almost always street driven ride with good throttle reponse, choke, and tuneable secondarys, can't beat a Q-Jet.

Pickup a used Q-Jet at a swap meet and send it to JET for a Stage 2 or Stage 3 tuning. I think a Stage 3 setup is around $300 to $325. graemlins/thumbsup.gif

http://www.jetchip.com/

The Q-jet sounds interesting, however I know nothing about them. All the tuning stuff that I own and all the knowledge (admititly slight) that I have is for a Holley. So I think it will be a Holley or clone for me.

The idea of a engineered carb is exciting to me. I am looking to spend about $700 us. Is this going to get me something that is decent?

Danb

i HAVE A 70SS 396 WITH A 750 Q JET, THROTTLE RESPONSE IS GREAT!, i HAD A HOLLY 650 SPREAD BORE, BOG BOG BOG ALL DAY LONG MY STALL IS 2000 SO IT IS ALSO TIGHT, i HAVE LOOSE SPRINGS FOR THE SECONDARYS


MY 2 CENTS tongue.gif

The Q-jet sounds interesting, however I know nothing about them. All the tuning stuff that I own and all the knowledge (admititly slight) that I have is for a Holley. So I think it will be a Holley or clone for me.

The idea of a engineered carb is exciting to me. I am looking to spend about $700 us. Is this going to get me something that is decent?

Danb Dan,
If you want a Holley, have $700 to spend, and don't mind not having a choke, take a look at one of these carbs; Holley's HP Series.

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSC/0-80528-1.html

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSC/0-80529-1.html

I have the HP 950 version on my big block and it is a nice carb. excellent throttle response good power. Probably the best "out of the box" carb you can buy.

How about the Speed Demon 750 Vac secondary then . . . a big DP carb makes me a little nervous with your stall and final drive ratio.

Holley makes 750 & 950 cfm vac secondary HP carb too. I think the 950 would be way overkill though.

Whelp.. I decided. It looks like it will be the hp 650 dp from Holley. I went with the 650 because I don't ever get over 6000, I shift at 5500. According to all the stuff I could find, if my engine achieves 85% va, I would need aprox 580 cfm. At 100% I would need 660 cfm. Everything I see indicates that 85% is about all I could hope for on a street engine.

I played with Engine Analyzer and found that the 650 lost only 4 hp at top end and 1 ft/lb of torque. However the average torque and hp is exactly the same. Just more stuff from 2500 to 4500.

Now I need to find a supplier, the city that I live in has one speed shop, they stock lots of bling and are short on any real parts. Any suggestions for a Western Canadian supplier? I sure would like to get this on and try it before it gets to cold.

Thanks for all the input guys, it sure made it easier to make an informed decision in a day rather than a week of reaserch. smile.gif


Danb

I have also been eyeing the 650HP DP for my streeter.
I just don't like the secondary linkage they come with.It's not the normal DP secondary linkage.It looks like what the 830 and 750 Annular carbs come with.

What do you feel is wrong with the linkage??

Danb

It uses a roller and ramp secondary action.
A normal DP uses a link.I have had two friends that have had this style linkage and both of them didn't like it as well as the normal set up.

Look at the middle of this link to see the roller and ramp style linkage.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2436724546&category=33550

Look at the middle of this link to see the normal link style linkage.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2436170194&category=33550

If the HP 650 works as well on your engine as the HP 950 works on mine, you won't be disappointed. graemlins/thumbsup.gif

Yes, I think I see what you are refering to Thrasher, It looks as if there will potentially be more force applied to the shaft. I would think a person would have to keep this assembley clean and lubed to work smoothly.

Man, I found one in Saskatoon today, the guy wanted $1200 Canadian plus taxes. :rolleyes: Crook. $609 us=$804 C. I guess I will wait for one from Jegs or Summit.

Have a great Thanksgiving weekend all. (Canadaian)
smile.gif
Danb

Dan, my 383, although a little more radical, according to the dyno sheet only required 677CFM at 6250rpm. this was with a V/E of 97% at that rpm. the engine was dynoed with a 950hp carb. we tried a 775 B/G ( that was not jetted properly)and it only give up 5 hp and 3 ft lbs. i settled on a 750hp and the car seems to run fine. Dave

Thanks for the confirmations Sheetmetal. With those kind of numbers, I belive that the hp 650 should be great for my purposes.

From the stuff that I have seen it seems the 650 flows 700 cfm with all the mods that Holley does. That should cover me for sure. :D

X-sheetmetal/frame guy ;)

Danb

I have a 650 Speed Demon VS electric choke I'd like to sell, If interested e-mail to ; barry@eugeneforestproducts.com

Thanks anyway OregonMalibu, smile.gif ( getting carried away with the little guys!!)
I think that if I did a vs it would be a 750.

Danb

**When it comes to the HP carb line**
Doug F., who works at Holley, and posts here, confirmed their flow rates.

All ot the carbs below the 950 flow close to their advertised number.
The How ever Holley took it upon themselves to inflate the ratings of the 950 and the 1000.
It seems the 950 flows closer to 830-850cfm and the 1000 flows closer to 870.

Read this post
http://www.chevelles.com/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=4;t=016849