performance difference between #1405 and #1406 carbs? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-08-2003, 12:05 AM
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performance difference between #1405 and #1406 carbs?

im wondering what the difference between the edelbrock #1405 and #1406 carbs are besides the 1406 having an auto electric choke. the site says the 1406 is calibrated 2% leaner than the 1405. would this make more power or less? is there any difference? i have heard the 1405 is more performance oriented but i have the 1406 on my 283 right now and it seems a little rich (little bit of black smoke, dark plugs) so wouldnt the 1405 be a step in the wrong direction (richer)?? thanks

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Old 12-08-2003, 01:15 AM
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this is off of the Edelbrock website.

according to edelbrock, your carb should have;
Quote:
Metering Jets: Primary .098, Secondary .095; Metering Rods: .075 x .047. Step-Up Spring: yellow (4" Hg).
Quote:
Cruise/Power Cruise/Power Cruise/Power
.057 x .049 #1437* .065 x .057 #1461* .070 x .057 #1418*
.058 x .052 #1438* .067 x .049 #1462* .071 x .047 #1453*
.060 x .052 #1439* .067 x .055 #1463* .073 x .037 #1454*
.060 x .057 #1440* .068 x .042 #1446* .073 x .042 #1455*
.062 x .052 #1441* .068 x .047 #1447* .073 x .047 #1456*
.063 x .037 #1442* .068 x .052 #1448* .073 x .052 #1457*
.063 x .047 #1443* .068 x .057 #1436* .075 x .037 #1458*
.065 x .037 #1444* .070 x .037 #1449* .075 x .042 #1419*
.065 x .042 #1416* .070 x .042 #1450* .075 x .047 #1459*
.065 x .047 #1445* .070 x .047 #1451*
.065 x .052 #1460* .070 x .052 #1452*
is it smoking at WOT, idle, when?
i believe the metering rod is the solution to your problem.
you 'should' currently have the #1459..... maybe a 1419 or a 1458 if its at WOT. you might even try stepping it down on the cruise side too, as its a 283, (no poke there) it might take even less rod than i think.

you can buy the calibration kit ,like this comes with a handful of metering rods and jets.... they're easy enough to swap out, so if you aren't pleased with the results, you can change it...
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Old 12-08-2003, 02:48 AM
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1405 is the "performance jetting", and 1406 is the "economy jetting" according to their catalog.

I agree with crazy larry about the setup.
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Old 12-08-2003, 12:20 PM
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so would the 1405 be a better performing carb for my setup or would it just make it richer than it already is and therefore lower performance? can the 1406 be easily jetted to be exactly like the 1405? should i switch to the 1405 or stick with the 1406 (i far prefer the auto choke over a manual)? thanks
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Old 12-08-2003, 01:17 PM
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Like i said, I agree with crazy larry about the setup. Buy a calibration kit and set up the carb. Stick with the one you have.
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Old 12-08-2003, 01:52 PM
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I have a 283 set up with the 1405 right out of the box--no changes in jets/rods/etc.

I have plenty of power, does not run rich, and get 20 mpg in a '27 rat rod.

Before you start messing with anything, I would do some gas mileage tests and check your plugs once more.

Oops! Make that a '28 rat rod. Lost a digit somewhere along the line!!!
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