73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: 78 BIG TEN on February 21, 2008, 08:08:20 pm
-
Stock 350..
Installed Edelbrock Performer RPM.
Leave stock 4-barrel carb or
Holley 700 cfm double-feed?
-
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......
-
On the Jeg's site it says the recommended cfm is 650-800.
-
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.
-
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.
-
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.
-
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.
-
Well the stock is electric and the 700 is manual. The intake only allows manual choke. Don't really care about gas mileage.
-
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.
-
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.
-
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 (http://i208.photobucket.com/albums/bb247/1985C10/choke01.jpg) 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.
-
Yes that is exactly what I am talking about. And what do you mean I can make it work? Different jets?
-
And what do you mean I can make it work? Different jets?
Yes, you need to dail it in for your application.
-
How hard is it to replace the jets?
-
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...
-
Well which ones will I need?
-
Well there goes that idea. I put the Holley on and it snapped around the mounting holes. So, I have to wait til payday for a new carb. I plan on doing headers and cam. Should I go with a 650 Edelbrock?
-
Did you overtighten it? When you install a carburetor make sure you snug it down evenly in an X pattern. The bolts shouldn't go any tighter than 132 in lbs
-
My Holley 4160 called for no more then 80inch pounds...Not to correct vile other Holley's have different inch pounds...But Holley sells replacement parts...So don't give up on that Holley...If u do sell it on ebay...Pepole will still buy it