Would a edelbrock 1407 (750cfm) carb be to much for my 350cid w/ stealth intake, comp 262 cam, double hump heads, 10.25:1 c.r. I now have a holley I don't know what size but it has vac sec's and I hate it. Any help would be great. I am fixing to buy some trick flow 23 degree heads and may put a rpm cam are a comp roller I can use on the street.

Thanks
Shane

While most "experts" recommend a carb around the 600 to 650 CFM range for a 350, the fact that the edelbrock has vacuum secondaries should allow you to use the carb no problem. Also, if you start winding 6,000 + rpms, you'll be glad you have it.

Just out of curiousity, what's wrong with your Holley? ie. what problems are you having?

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'69 Restification

I agree if the Edelbrock carb is vacuume operated.IF it is mechanicle it will be too much at your curent state of tune/combination.
I for one would not recomend the Performer RPM cam.Unless you have serious vacuume issues(power breaks,steering and A.C.).A cam with 110 lobe seperation angle should be used.It will bring about beter TQ and HP.If you don't have any accessories,than one should use a cam with 108-106LSA.



[This message has been edited by mutant 68 (edited 11-11-2000).]

I thought that the edelbrock was macanical sec's. Thats why I was wanting it no changing springs to adjust the sec's. Theres nothing wrong with the holley I just don't like the way the vac. sec work and don't want or know how to do all the tuning with the springs.

thanks
shane

Sweems:

Why dont you try looking at the Good old
Q-Jet ,preferibly one That has not been molested by some Carb Specialist Company.

I found my 327 (11:1) 298deg cam realy came alive When I went from a 600 cfm Holley to a
standard Q-jet off a local (South
African) 308 australian motored Holden.

If I recall correctly There is a certain amount of Adjustment That can be made to the spring rate of the Secondries Air flap,via an Allen key on the side of the air horn.

If you are interested , I can try answer any Questions you may have,(my Best friend and his Father have Rebuilt and tuned some 50 to 60 carbs between them ),but Im sure some of the more experienced members Will Be able to help With Q jet Questions.

By the way dont let the complexity of the Q jet scare you , if you can get someone Who Knows them to help they really are sweet on the street.
Lets face it GM Did not build a carb Twice as complicated as a Holley ,just for the fun of it.

Hope you find the carb that meets your needs

Cesare.

the 750 edlebrock that I have is mechanical sec's. I think it is a 1407 as well.

Ive got the Edelbrock 1407, 750 cfm on my 355 9.1 comp. Out of the box it is just a bit much, but with the Calibration kit I can lean it out to a horrible stumble for emissions. Right now I am running 2 stages lean with great response and decent gas mileage, and changing jets is a snap. Sean

where did you get the calibration kit at and how much did it cost?? Thanks
tim

I got my kit at Autozone, it's around 50 bucks but comes with 6 different rods and jets and 4 or 5 springs. I'll get the part # for you. Sean

[This message has been edited by SAyers69 (edited 11-13-2000).]

My opinion:Get rid of the edelbrock and get a real carb.Maybe a speed demon or a holley double-pumper?Come on guys....

I agree, Edelbrock carbs are for drivers or mild engines. The Edelbrock Q-jet's are great for street cars, under 400 HP. They work much better than the Performer AFB's, you couldn't give me a AFB, Edelbrock or Carter!.

On the air horn of the Vacuum holley you are running is a list no. (0-1850 + 600CFM 0-3310 + 750CFM) the 3310 has center hung floats like a Dbl Pump'r and therefore needs a dual fuel line. the 1850 uses a transfer tube from bowl to bowl on the drivers side. The best think you can do with a vacuum holley is get a "quick change kit" for the diapragm springs. and play with lighter (faster acting or heavier for later seccondary action) Get a vacuum gauge to help you dial this in, and consider changing the Power valve. I have done a ton of dyno testing and have found that 300-320 HP 355 chevies use less than 450 CFM of air at WOT, peak HP. A 600 either vacuum or or manual CFM properly tuned will produce great results
my .02
Other opinions? jk