[81elcamino]

so we finally fired up the 283 about 30mins ago and it ran great, still need to set the valves but the 650holley on it is just to much so we need to get something smaller, i was wondering what everybody would recommend and it needs vaccum secondary. also isn't there a equation to determine the cfm for cubic inch

[302 Z28]

600cfm Holley model vac secondaries, or a small AFB would be great. You didn't say what you have done to the 283, or if you even have headers on it. Back in high school I had a 56 Chevy 210 with a 283 punched out to 292. cast iron Corvette exhaust manifolds. I had a 600cfm Holley on it and it ran great.

Vince

[lluciano77]

A 600 vacuume or double pump should be fine. Don't believe that equation for a second. Try punching in some real life figures and you will see what I mean. If that were true then almost every factory muscle car ever made is way overcarbureted. It is a baseline equation and doesn't take into account a million other variables needed to get the answer you are looking for. It's all about trial and error and paying attention to what other guys with similar combos are running, and how well their cars run.

Here is that equation:

Engine cid (cubic in.) x Maximum RPM
------------------------- -----------------
2 1728


or,

Engine cid x max RPM
--------------------------
3456

[Deuce]

I use a 500 CFM Edelbrock on my 283.

It is bored 60 thousands over and has a solid lifter cam. Weiand aluminum intake. Runs good ..............

I have had a 600 CFM Edelbrock on it and it pulled a little better at Wide Open but everyday driving .....the 600 was NO better than the 500.

[81elcamino]

its a 67 283, it has 327 heads, a cam, offy intake, and headers i dont know the finer specs to the motor because it was rebuilt a long time ago

[scott ticknor]

Greetings!I was wondering the same thing a few weeks ago and used the calculation shown on this thread . I figured that realistically, 6 grand would be the absolute max that the wee mouse MIGHT ever see, and I think it worked out to 491 + change.So,I`m going with the 500cfm edelbrock performer.

[81elcamino]

ok so we got the 600 holley and it works great, needs to be rebuilt but other than that its good only cost $40

[85CHEVY]

I would use the 500 cfm edelbrock, because it is a four barrel but wont run as fat as a 600 edelbrock. I had a friend that went from a 600 to a 500 and the gas mileage was better as well as his throttle response. Supposedly that little carb is jetted for performance for small V-8 so that should be more than adequate for the 283.

[Tech @ BG]

On a 283 we'd run a 525 Road Demon Carburetor. The annular boosters in the carburetor, and the vacuum secondaries would give excellent idle quality, throttle response, and overall drivability.

On a 283 we'd run a 525 Road Demon Carburetor. The annular boosters in the carburetor, and the vacuum secondaries would give excellent idle quality, throttle response, and overall drivability.

[philPKP]

HI 81camino, I put a 283 in a 66 chevy p/up couple of years back,could"nt afford any fancy gizzmo"s then so had to make do with a 2bbl nikki carb.anyhow the engine ran sweet ,with plenty of torque.I don"t know if you"ve heard of AINTREE RACE COURSE,in LIVERPOOL ENGLAND.(home of the GRAND NATIONAL HORSE RACE?) Anyhow it"s got a car racing track on the inside of the horse track!to cut a long story short>>I DROVE THE 66 ROUND 2 laps of the track,getting chased by the track marshal(in a tuned ford anglia) + the bugger could"nt catch me!!
I think the 283 chev is a darn good motor,whatever carb you decide on......RIDE ON.....PHILPKP