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Old 04-11-2010, 08:28 AM
Rhansen's Avatar
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Edelbrock 1406 jetting

I was wondering if anyone could recommend a baseline jetting for my combo, IIRC it currently has the 1427 main jet and 1455 rod on the primary side and the same 1427 jet on the secondary side - roughly 4% rich across the board.

Combo is 350 chevy in an 83 ex cab S10, 487x heads, rpm intake, ede 1406 carb w/4hole wooden insulator/spacer, ~10:1 cr, comp xe274 cam, MSD 8501 kit on an HEI - 1 med and 1 light spring, 1.5" tube shorty headers (cheap s10 swap headers by hedmann), 2.5" duals, 700r4 with 4.10 rear gears (for now - looking to switch to 3.50-3.73 soon). Timing is currently set at 12 initial and 32 total +10 deg for vac advance (manifold not ported) until I burn off the old gas and can get it to the track for some tuning.

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Old 04-12-2010, 11:19 PM
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I would read a plug following idle, cruise, 2bbl acceleration, then WOT.
You can tune it pretty close by doing basic plug readings.
Avoid white (lean) plugs during WOT.

My 365HP 351W (***not same as your engine I know***)with 600cfm 1405 edelbrock runs well with:

Main jet=0.104"
Rod: 0.075" x 0.037"
Spring=silver
Sec jet = 0.104"

You are using 0.098 prim and sec jets and 0.073 x 0.042 rods which I would expect to be way too lean.

Last edited by 001mustang; 04-12-2010 at 11:41 PM.
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Old 04-12-2010, 11:41 PM
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Here's the Owner's Manual...
http://www.edelbrock.com/automotive_...ers_manual.pdf
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Old 04-12-2010, 11:54 PM
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... when all else fails ...read the instructions...

I did not feel comfortable tuning carb on the street using manual's stop watch method.

For me, plug readings are much easier and I don't have to manage a stop watch or worry about potentially doing several detonating WOT passes not knowing if I am running way too lean.

I found the charts around page 22 to be a useful reference.
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Old 04-13-2010, 07:33 AM
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Yup, the Edelbrock "Owner's Manual" is the hot ticket. You might also invest in one of their Kits that has springs, jets, rods, etc. in it. I can't remember what it's called...
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Old 04-13-2010, 11:57 PM
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I was able to use rods from kit but my kit did not have the 0.104 jets I ended up needing.
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Old 04-14-2010, 07:59 AM
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Thanks for the input guys. I already have an owners manual (had this carb for six years or more, been on the shelf for the last three) and about half of a calibration kit, just wanting an idea where to start before I get it to the track - I've only put about 20 miles (cruising) on this motor since cam break in. I'm tempted to buy an 02 sensor but money is tight right now.

So I should fatten it up a bit for starters. Can someone refresh my memory on the springs, the color(s) is(are) gone but IIRC taller spring = quicker opening?
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Old 04-14-2010, 11:38 AM
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Quote:
Originally Posted by Rhansen
Thanks for the input guys. I already have an owners manual (had this carb for six years or more, been on the shelf for the last three) and about half of a calibration kit, just wanting an idea where to start before I get it to the track - I've only put about 20 miles (cruising) on this motor since cam break in. I'm tempted to buy an 02 sensor but money is tight right now.

So I should fatten it up a bit for starters. Can someone refresh my memory on the springs, the color(s) is(are) gone but IIRC taller spring = quicker opening?
Each increment stiffer will allow enrichment sooner (i.e. at a higher vacuum).

3 in. Hg blue spring
4 in. Hg yellow spring
5 in. Hg orange spring
6 in. Hg pink spring
7 in. Hg plain spring



Now the thing is, the springs are NOT shown in order of their relative stiffness! For some reason known only to the ad department, they've artfully arranged them by length, not by stiffness.

So from L to R, the springs shown are (I THINK!):

PINK
ORANGE
PLAIN
YELLOW
BLUE
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Old 04-14-2010, 12:44 PM
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Nice post Cobalt.
The color is worn off some of my springs.
I can use the photo to help verify spring strengths.
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Old 04-14-2010, 06:24 PM
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Thanks cobalt for the very helpful post. The color sure wears off those springs in a hurry, must be a conspiracy to sell more
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