Thread: 283 question

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the dual quads that were used on the early 283's were Carter WCFB's, not AFB's or Edelbrock AFB clones. I don't know the cfm rating, but they were tiny compared to today's carbs.

Originally posted by techinspector1
the dual quads that were used on the early 283's were Carter WCFB's, not AFB's or Edelbrock AFB clones. I don't know the cfm rating, but they were tiny compared to today's carbs.

Tech,as I posted earlier in this thread I believe they were somewhere around 300cfm. I had a matched pair years ago and the front carb for all practical purposes was gutted. The throttle bores were about the size of a quarter.

maybe not a stock 283 but i could certainley use 2 390's of the 450's easily

Originally posted by gassersrule_196
maybe not a stock 283 but i could certainley use 2 390's of the 450's easily

Could I use a holley carb #8007 390cfm rating in my 283 or think it would need the 500 cfm you stated

A 390 carb will feed a 283 just fine up to about 5,000 rpm's.

get a 600 and quit asking what carb to use a 600 holley works fine its not to much if it was it wouldnt of worked for me ......scooter

See Kids this is were Math in school was important!!!

I wish i would have payed more attention cause all this confuses me.

Originally Posted by 64Galaxie

See Kids this is were Math in school was important!!!

I wish i would have payed more attention cause all this confuses me.

I like Denny's formula.....cubic inches times 2 equals cfm.

I had a hot 283 in a '54 Bel Aire in the '60's. My brother had a 3-bbl Holley, we bolted it on one day just for laughs. It would bog like mad at anything below 5 grand, but when it caught, all hell broke loose. She'd howl like a raped ape and go all squirrely! 4.11 posi and 15" rubber, right up in smoke! Unfortunately, sooner or later I had to shift to second, and start all over. Don't think I ever got it past the "bog" in top gear, 5 grand was not possible the way it ran. Everybody told me to richen the secondaries, but you could drop a wooden match through the stock jets and not touch the sides. An economy carb it was not! Don't recall the CFM, something like 1150? It worked on a 440 Magnum, but just a tad bit big on a baby mouse.I guess the moral of the story is, you can make anything work, kind of, if you're dumb enough to try it.

Originally Posted by SBC

Thanks Doc -

I thought if I could put together a typical 220 HP 283 I'd be happy for starters. But I think I need 600+ CFM (4 barrel) to do that.

I would think a shorter stroke will increase RPM.
Or a higher cumbustable mixture to get it moving faster?

I can't find a proven specification for the 220HP 283 other than 4 barrel carb in general descriptions.

Then there was a dual-4bbl 275 HP Corvette engine I think.

OK - not ready for that!!!!!

Why a 283? - that's all I have.
I have considered the 327 crank but I don't think the 1965 block will accept it.

Bert

The old 283s had WCFB or 4GC Carbs while the later engines (up till 66) had the Rochester 4GC. I think they were around 485 CFM The Dual four 283s came in 245 hp or 270 hp. The 245s had the hyd cam while the 270s were solids. Dual fours on the 283 ended in 1961.

Bob

Originally Posted by gassersrule_196

get a 600 and quit asking what carb to use a 600 holley works fine its not to much if it was it wouldnt of worked for me ......scooter

A 600 cfm carb. will work if you plan on turning the engine above 7,000 rpm's.

are you sure?

depends on the compression, our old 301 had 11:1's and the 600 worked fine it ran 13.1 all day long every weekend. ive done that cfm calculation and i belive mine came out to 654.7 but i had a 650 on there and it didnt work for nothing. put the 750 on there runs good, just a matter of dialing in the air-bleeeds for the weather now. <well when the tracks open bout 3-5 inches of snow here now <barfs>

Originally Posted by gassersrule_196

depends on the compression, our old 301 had 11:1's and the 600 worked fine it ran 13.1 all day long every weekend. ive done that cfm calculation and i belive mine came out to 654.7 but i had a 650 on there and it didnt work for nothing. put the 750 on there runs good, just a matter of dialing in the air-bleeeds for the weather now. <well when the tracks open bout 3-5 inches of snow here now <barfs>

Copression has nothing to do with picking a carb.
The old CID X MAX. RPM'S DIVIDE BY 3456 still works great.

Originally Posted by gassersrule_196

depends on the compression, our old 301 had 11:1's and the 600 worked fine it ran 13.1 all day long every weekend. ive done that cfm calculation and i belive mine came out to 654.7 but i had a 650 on there and it didnt work for nothing. put the 750 on there runs good, just a matter of dialing in the air-bleeeds for the weather now. <well when the tracks open bout 3-5 inches of snow here now <barfs>

Geez Scooter, never took you for a lightweight!!!! Get them new studded drag slicks and get out there and do some bracket racing.!!!! Not too much longer around home here and the lakes will all be frozed good and solid so I can go out and practice my uncontrollable slides across the ice. Just getting ready for Bonneville, ya know!!!!!