[cooz65]

Hey guys, real quick question. Currently in my 65 elky, I have a 283 with a Holley Street Avenger 670 sitting on top. When I bought the car from the guy, he said the carb is way to big for the engine and when stomped on, the engine will putter before reving up. He said to find another Street Avenger, but get the 570. It sounds like the 500-600cfm range is good for this engine. I've also heard of some people running the edelbrock 600. Just looking to get some others input before I go about getting another carb so I can get her out on the street for this summer!

 

[steelybill]

The original carb was a Carter WCFB, which was likely no bigger than 500 CFM.`

 

[badmoon47]

The problem with running a 670CFM carb on a 283 is that "out of the box" a 670 is jetted for an engine that flows 670CFM. You can run a 670 all day, but most likely will need to go down several jet sizes to keep the little 283 from running too rich. If the car is bogging when you get on it, you could also adjust the accelerator pump shot to squirt less gas. You can buy a smaller carb which will come jetted closer to your needs or try swapping out the jets (very easy on a Holley) and see if that helps. Good luck!

 

[ACZ66]

I agree with the jetting, also your timing, cam, etc. I've seen 283's with 3x2's, even 2x4bbl, but for a normal street motor i would stay in the 500 area. My son's 64 has a 283 w/ a little 2bbl holley and runs like a top, although it ain't gonna win any races! :beer:

 

[Jack_K]

Check online with the Holley Tech guys. They'll tell you rejetting the 670 is a waste of time since the venturi areas are much too large to make the carb work satisfactorily. There are other things to change on the carb, too.

Notice I said satisfactorily. You can make it work, just not at its best.

Get a 450 or 500 cfm carb.

Better yet, stick a SBC 350 under the carb.

jack

 

[~JM~]

I have a stock 305 with an Edelbrock Performer manifold on top. I found a Holley 450cfm 4-Barrel that I rebuilt & installed. The engine runs real sweet now, very responsive & much cleaner than with the crapped out 2-Bbl that it used to have.

See if you can locate another Holley 450. They are a great little carb.

~JM~

 

[steelybill]

The small CFM carbs can't make big power, but they can really work good for smooth reliable drivability. The 670 CFM mentioned would work fine on a 383, but a 283.....100 less cubic inches to feed.....not likely a good choice...

 

[JJLT1]

stiffer secondary spring..
a bigger carb on a smaller motor usually needs more pump shot..
not the ideal setup,, but it all depends on the motor.. :texas: