VinMichael

Build:
60 over
stock replacement shallow dish pistons
stock GA big valve heads
headers
2500 stall
3.73 gears
cam Erson Hi Flow 1, 228/228@.050 with .504 lift on both
ebay China HEI
performer intake
stock mechanical fuel pump

would an 870 Street Avenger be too much? I ask because I can get one that’s practically new for $250.00.

BangScreech4-4-2

I had a 670 CFM Street Avenger on a SBC Camaro and it was a great carburetor. Ran great right out of the box and if that wasn't enough, it was just about infinitely fine-tunable. Very crisp and linear throttle response -- better than EFI! Your build sounds like it could probably handle 870 CFM.

cutlassefi

Then you had a lousy Efi. 870 is fine but buy a wideband and tune it the right way.

BangScreech4-4-2

Okay, maybe not better, but pretty damn good.

BILL DEMMER

a properly calibrated quadrajet, period.

bill

Firewalker

You may not need that much carb, but thats not the same thing as being too much, and at the same time if it doesn't make you happy then you can probably sell it easy and get your money back. But would advise to get it get looked over first by a friend of yours that knows something and check the number on it to make sure it is what it is claimed.

VinMichael

Seller said carb came with 78 jets and a 4.5” PV in the primary and 82 jets and a 3.5” PV in the secondary

matt69olds

Get a properly rebuilt Q-jet, one that is calibrated for your application

VinMichael

picked up the Street Avenger 870. Almost looks new.

A lot of people talk up the Q jets. one day I’d like to try one but for now I need something to bolt on a go.

Firewalker

This would be probably hard to beat for bolt on and go https://www.ebay.com/itm/Factory-Ref...-/361537275602

cutlassefi

Question, why do you all think a lot of these carburetors are bolt on and go? As good as the Quick Fuel stuff is that I use, I normally have to make a jet and or air bleed change to make the fuel curves correct. And those are much higher dollar carburetors than what you guys are talking about here. I'm thoroughly confused how people can say that most of these, if not all, are bolt on and go.

Firewalker

Do you call fine tuning them, to be the same as bolt on and go is my question??? Or did you just confuse apples and oranges??

shiftbyear

It's always a good practice to disassemble a new carb and verify jetting, cleanliness and proper gaskets. Mass produced anything is subject to mistakes. Good luck with your project.

Firewalker

Don't trust but verify and learn. I try to learn first, as much as possible before verifying by reading and looking at videos and pictures, and then try and verify. It can be a good lifetime approach and investment.

VinMichael

What I meant by bolt on and go is get the engine started to break in the cam, and get the timing and carb in the ballpark until I am ready to get serious about tuning the car. Which will involve a wideband o2 sensor.

Firewalker

Thought thats what ya meant, or something quickly drivable. But what ever you choose you probably need to use a current running carb, if available. Or a new carb after you tear it down to make sure it is clean inside and the floats are set right. On breaking in the cam if you have any troubles shut the process down fast, and then restart once fixed. The 20-30 minute breakin time doesn't have to be all on the first go, without a shutdown. The latest recommendations in fact advise 10 minutes and let it cool down and then another 10 minute segment I recently learned. Once started and rpms sets check timing first and get it in the ballpark. Watch oil and water temps and set a timer.

VinMichael

I can can use the Edelbrock 600 that I ran for years on my 350 for the cam break in. The trouble is I sold my stock HEI distributor with my 350. So unfortunately whichever distributor I receive I won’t be confident that it will fire right up.

Firewalker

Old carbs can stick on the floats so at least turn it over in in you hands a few times to hear both floats are free, and not sticking. An electric to pump gas in it before firing it is a good idea to make sure no drips while the pump is turned on. And make sure the shooters both squirt fine still. You can install a distributer and put the engine by turning by hand to 15 degrees or so advance. Then with power only to the ignition see which spark plug spark by rotating the distributer cap counterclockwise slowly. The sparkplug that snaps is number one (the way you have your distributer sitting) and the timing should be about 14 advanced when lock down. But a fast double check once started is always smart.

VinMichael

Do you mean set the timing marks on the balancer pointing to 15 degrees BTDC, then rotate distributor counterclockwise until plug #1 fires. By the time I lock it down after I see a spark I will have ignition advance at around 14 degrees BTDC.

Bryan Burch

EFI, all day.

Firewalker

Pretty much and you can do this before the carb. The timing will move some, as you tighten it down but you should be in the ballpark. Anyone with a better way lets hear it now LOL

cutlassefi

You can bolt just about 4150 flange style carb on just about anything. So you would potentially bolt on a carb that could be running dangerously lean, especially during break-in. Really?
You're right, apples and oranges.

TripDeuces

I haven't seen a Holley type carb yet that is bolt on and go. I'm not down on Holleys at all but they all need to be tweaked.

Firewalker

Take the engine to BTR for breakin on his dyno, if you want it done right

cutlassefi

My point is don't take anything for granted.

Firewalker

BangScreech4-4-2

Regardless, VinMichael, let us know how it works out. As I said above, I was pretty happy with mine.

droldsmorland

X2 what Bill said

VinMichael

Thanks. Hopefully I will be circling back with results sooner rather than later.

Firewalker

VinMichael