Which carb?

[78 BIG TEN]

Stock 350..
Installed Edelbrock Performer RPM.
Leave stock 4-barrel carb or
Holley 700 cfm double-feed?

[JJSZABO]

I would keep it stock - from what i read on here, 700 CFM is too much for a stock 350.  Someone else should pipe in though......

[78 BIG TEN]

On the Jeg's site it says the recommended cfm is 650-800.

[86 chevy silverado]

Not for a stock 350. Heres a quick formula to calculate needed cfm;
Engine size x max RPM divided by 3456 = CFM
ex. 350ci x 5200 RPM divided by 3456 = 526.620cfm, a 600cfm carb is enough for your motor.

[choptop]

If the stock carb is in good shape, use it. If it is not, I would use anEdelbrock 600 cfm. I have had good luck with these carbs, but make sure you order the banjo fittling so the fuel line will clear the stcok aircleaner.

[eventhorizon66]

I would say the RPM manifold is not a very good match for a stock 350.  A performer would be better unless you know you're going to throw some serious parts at it some day.  I agree with the others here, something in the 600 cfm range would be best for a stock 350.  I'm currently using an Edelbrock 600 cfm carb on my Goodwrench 350.  Runs strong.

[Captkaos]

Ditto on the above, for a stock 350 that sees no more than about 5500 rpm MAX 600cfm is Plenty.  If you did put a 700cfm on it, you will have to jet it down to make it run well.  I agree on the intake as well, you want something that has a power range from about 1500-5500 for a stock 350.

[78 BIG TEN]

Well the stock is electric and the 700 is manual. The intake only allows manual choke. Don't really care about gas mileage.

[eventhorizon66]

What do you mean the intake only allows a manual choke?  It doesn't have provisions for a hot air choke (if that's what you thinking), but you can use electric if you want.  And it's not only gas mileage you will lose with too large a carb.  It's vacuum, throttle response, and overall power.

[78 BIG TEN]

On the stock intake the electric choke was screwed on the intake itself. First, can't get the old screw out. Second. I would have to drill a new hole in the Performer intake. I already have the 700 Holley too. Bought the intake and the Holley for $120.

[eventhorizon66]

OK, I think what you are describing is a divorced choke, meaning the choke is operated remotely from the manifold and connected to the carb with a rod.  But on a holley, edelbrock, or later Q-jet carb the choke is mounted directly to the carb (no need to bolt anything to the manifold).  Here's a pic of my edelbrock carb mounted.

You can definitely make the 700 cfm holley run on that engine, it just wouldn't be the best choice.

[78 BIG TEN]

Yes that is exactly what I am talking about. And what do you mean I can make it work? Different jets?

[eventhorizon66]

And what do you mean I can make it work? Different jets?

Yes, you need to dail it in for your application.

[78 BIG TEN]

How hard is it to replace the jets?

[Redneckchevy]

On a holly its all about taking of the float bowls and Taking out the old and putting in the new ones...Holley.com has lil videos on hot to do it and stuff...