camaro1122

iTrader: (1)

Hey everyone i just got a new engine, its a gm crate engine with 330hp and 345lb of torque. I need some help picking out a good carb, i want something that will work good with this engine and ill have power from it. The one that was on there was a 650 edlebrock, my buddy said to go with a 850 something but i would like some recommendations from people that have one and has had a good experience with it. Thanks

383 Power

iTrader: (2)

I think that 850 would be a bit much unless you are going with a Quadrajet. The Most i would try on that would be 750. Actually, that Edelbrock might work in a pinch. I would drop that on and see how you like it. if it feels like it's starving on the Highway, get a bigger one. I'm not an Edelbrock fan, but why go buy something when you can try what you have? It's not like you have to tear the engine down to replace it if it doesn't work the way you want it to. I'm sure that you could AT LEAST break the engine in with that carb.

camaro1122

iTrader: (1)

I know nothing about carbs lol, the GM crate engine im buying has about 14,500 miles on it so its broken in but should still be a fresh engine. The 650 that was on there the guys taking with him so i need to get one. Ive heard a lot of positive stuff about quadrajet carbs but i have no idea what type of power it gives. Basically i want a carb that i will feel happy with that i dont need to replace because i need more power

383 Power

iTrader: (2)

Well, from what i've seen, Quadrajets ARE good carbs. Since you don't have a carb, You have two choices; get a new one, or buy a used one and rebuild it. If you have the cash, you can buy an Edelbrock at most parts stores for fairly cheap (a few hundred bucks). you could go to the junkyard and find a good looking carb, but it's always a good idea to rebuild ANYTHING you find in the junkyard. I'm fighting with a Holley that I got at a junkyard for $32. It's a 1850-3 (600 CFM Vacuum Advance). Looked like it was well used on the outside. When i opened it, it had Craploads of dust everywhere. It looked like the power valve and jets were RUSTED, but not too bad that they didn't come out easily. The Junkyard solution would PROBABLY be cheaper, but it requires more work and alot of care on your part. You will also have alot of questions to ask if it's your First Rebuild. I Know, I'm about to ask one. Look for it in a new thread. Whatever you do, i wish you luck. I would suggest something 650-750ish. That should be plenty.

iroc-z_23

iTrader: (1)

I'd recommend a 750 holly style carb, quick fuel has reasonable prices on theirs..I'd look around on craigslist for 750 double pump I think you'd be happy with one of those, and yes always go through used carbs!

camaro1122

iTrader: (1)

And also if i can ask whats the difference between a manual choke and electric choke? The holly double pumper carb i just looked at has a manual choke

383 Power

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I'm sure someone will correct me if i'm wrong here, but on a manual choke, you set it by putting the gas pedal on the floor and then RELEASE before starting and an Electrical works off of an ignition controlled wire.

five7kid

iTrader: (14)

Manual choke: Slightly depress accelerator, pull out the **** on the dash, let off accelerator, start car. Push **** in slightly, keep pushing in a little more from time to time as the engine warms up until fully open and running well without choke.

Electric choke: Slightly depress accelerator, release. Start car. Drive away. The voltage will heat up the choke thermostat so the choke opens gradually as the engine warms up and is fully open when the engine is fully warmed.

You can convert a manual choke Holley to electric with an electric choke conversion kit (~$45). I have one that I didn't end up using that I keep telling myself I need to list for sale.

Most likely the intake manifold on this crate engine only accommodates a square bore carb (q-jet = spread bore). You would either need a spread bore to square bore adapter, or a different intake manifold. If this is the 330 HP "HO" crate engine, it has Vortec heads, which requires a specific Vortec intake manifold.

camaro1122

iTrader: (1)

The stuff that was on the engine was edelbrock, id rather not put that stuff back on. Ive spoken to a few guys a summit racing on the tech line and they say a 750 double pump is way to big for the rpms im at. Im guessing this engine is between 5000-6000 rpms, and they said it will just flood the engine out. Haha i remember the first movie transformers about his double pumper. This engine im trying to get the most i can out of it, my last engine was the LB9 305 and that engine was alright but i couldnt ever get anything out of it unless i was willing to spend a few thousand and still even then id be lucky to see 350hp. Im really liking the holley 750 double pumper, would you guys recommend getting that?

pancherj

Still not enough info... What heads (stock or aftermarket)? Camshaft? Daily driver or just-for-fun vehicle? Ignition system? Any idea what compression?

A 750 would not necessarily flood the engine out. What would happen is, if your engine only needs a 600, the 750 would have little signal too the booster. You wouldn't pull enough fuel and it would be tough to get it to run right (no throttle response, etc.).

camaro1122

iTrader: (1)

The guy said there was head work done but im pretty sure their stock, he also said theres a cam an i would beleave that. The engines a Gm crate engine 330hp 345lb torque. This will be a daily driver, but not to far places. Ill use another car for the far places, and my rear end gear right now is 2.73. Im going to change it to a 3.23-3.73 so in that range, not sure if im getting a 9 or 10 bolt. Compression said to be 10to1 but we did an actual compression test which the cylinders ranged from 155 to 160.

Badass355ciz28

iTrader: (17)

i would recommend the holley 670 avenger carburetor for your application.......electric choke, pretty much only thing you will have to do is ajust the a/f mixture screws.. id set them to 1 3/4 to 2 turns out...and set your idle......i think a 750 would be way too big of a carburetor for you for that engine combo.

pancherj

Performer intake (or similar) and the 670 carb sounds good. If it still has stock rockers, you may want to think about upgrading to 1.6's.

t-top havoc

iTrader: (3)

camaro1122--
Can you post pics of the intake? Like a side shot & top shot?
Was this in a race car? Street // strip car?

Intakes with just 1 huge opening are mostly for hi-RPM driving // racing.
Known as a " Single Plane intake "

Intakes with a " shelf " are used for mostly daily driving, and can be used successfully in street // strip cars that don't see too much more than 5800 RPM.
Known as " Dual Plane intake "

With a 650, I would believe it's a " Dual Plane " but I've seen a small carb on a single plane......
Friend of mine back in school...

t-top havoc

iTrader: (3)

Good idea.

See what the rockers have stamped on top of them, if anything.
1.6 rockers will make the motor " act " like it has a lil bigger cam.

If at all ppossible, ask the PO if he recalls what the cam is. That will be a big help, & what was done to the heads--
Ported, polished, gasket-matched, decked?

86jjk656

Aw gees, what was it? 1.8 cfm per cubic inch displacement. a 600 to 700 cfm should work fine. the key to the whole deal is to properly manage your air/fuel mixture. thats done by tuning your carb. I know a little about edelbrock, you can easily swap out jets and step up springs n such but a air/fuel meter bolted onto you intake manifold with a gauge on your dash will keep you in the realistic realm of fuel efficency and power. some correct me here if im wrong about the reccomended cfm/ci ratio

camaro1122

iTrader: (1)

Yes there is a shelf in it. Ill post pics right now. Its good hearing from you again, i hope this engine wont give me problems like the 305 lol

camaro1122

iTrader: (1)

Here the first batch of pics, and the a pic of the engine it was on

camaro1122

iTrader: (1)

second batch

camaro1122

iTrader: (1)

And the third, can anyone identify this intake? Even the people that had the engine didnt know what it was. And also whats up with it made in china lol is this a junk intake or most intakes are made in china?

86jjk656

a single plane will excell with with higher rpm motors, due to the gains in horsepower, where a dual plane will excell in torque at lower rpms. i would love to run an edelbrock performer rpm, but by defination it is a high rise dual plane intake. My hood clearnace is limited so my choices were limited aswell.
you know, just to ramble on, the dual plane is ideal for increasing your torque, off the line, lets go fast now, type of stuff. The single plane will, once your going fast, maintain a "horsepower" that will make you go faster, while your going fast.
so many engine combinations, so little funds.. fml.

86jjk656

hey how did you post pics? i was trying but i failed.

camaro1122

iTrader: (1)

Yea i hear you, im going to go with an SS hood so clearance will probably be an issue. Ill be honest when the guys were removing the engine from the car it was built halk ***ed. Bolts were missing, welds were poorly done on the exhaust. It was out of a dotsun so that car flew with this engine. But im not impressed with the parts they built the car with. Would you recommend putting this intake back on or get a better new one if there is? I mean come on there was an ant pile on the intake...

camaro1122

iTrader: (1)

I clicked the reply button, then clicked "go advanced", then scrolled down to where it says manage attachments, then click the browse button find the pics, then press upload, wait until there uploaded and click the "submit reply button".

five7kid

iTrader: (14)

Probably a Professional Products Cyclone.

Whether or not it's junk depends upon who you talk to. Some say junk, others say good low-priced alternative to Edelbrock.

For sure it doesn't look like that engine got much love.