283 Carburetor thoughts

[RTHarvey]

Originally Posted by MikeB

That's pretty clever leaning out the carb to pass emissions. I recently changed the primary jets and rods on my 1406, and made a note in the back of the user manual showing the parts and the date. Otherwise I'd forget what I did in a few days!

Some guys say Edelbrock carbs suck, but I think they're just fine for a mild engine making at least 18" of idle vacuum. Also, the relatively new AVS2 is getting rave reviews even from Holley guys.

They are also very easy to tune. I ran a 1406 when I lived in the mountains, and got it jetted for 5000-7500 ft elevation using the user manual chart. When I moved back to the lowlands, I spent around 15 minutes re-installing its "as delivered" jets and rods.

Just don't bolt any of them them directly to the manifold, but instead use a wooden or phenolic spacer/insulator to keep the the ethanol in fuel from boiling on very hot days.

Edelbrock #9266

I like the idea of the insulator block. I think the gasoline we can get now has a lower boiling point, and is generally just more volatile (in the original sense of the word--easily evaporated). I have had problems with gas boiling or evaporating quickly on a number of cars. (old ones, of course_

[Rust_never_sleeps]

stumbled across this, with the Dualjet that was prolly original to yours
Even if you could scrounge a carb and manifold, it's probably as much work to tune a Dualjet as a Quad, since most of the effort is on the primary side and choke anyway.

[MikeB]

On the Edelbrock carb, the throttle linkage opens the butterflies for the secondaries, but the air valve only opens if the engine demands more fuel. So, the secondary venturi size cannot be too big for an engine, unless it's a mechanical secondary carb, like a double pumper Holley. That's why Q-jets with their giant secondaries would work on just about any size engine.

What's more important for drivability is primary venturi size. But I think a 283 would be just fine with up to a 600cfm Edelbrock, which has smaller primaries than a 600 Holley. Maybe even the same as a 500 Edelbrock.

['68OrangeSunshine]

No carb I ever dealt with ran good right out of the box. They all need some attention setting up.
Another factor related to your reported ''stumbling '' at WOT -- what ignition system are you using? Points or HEI?
I recommend GM HEI.
And a phenolic riser on V8s.

Not a PerTronix fan as their replacement parts are hard to come by, their tech support is poor, and I had one crap out on me.