Stumbling Edelbrock 1409, 4.3l, V6

[NHGuy]

Well it will still be good information. I wish you a great result!

 

[jimmbo]

Write down every change you make. If you have to undo it, memory will fail you

 

[Rick Stephens]

Write down every change you make. If you have to undo it, memory will fail you

Great point. Your right - plus good notes can point out that combo that didn't get tried and yet slips everything into place. Thanks for the good tip.

Rick

 

[Rick Stephens]

Off to the lake in the morning. I bumped the primary jets from .089 to .092 and upped the metering rods from .68 x .057 to .65 x .057. I left the 7 inch pink springs in. When I open the throttle a little the meter rods pop up for a little bit before vacuum builds back up and they drop right back down. Now to run it and check out plugs.

 

[Rick Stephens]

Jetting is looking good. I am very very close now. Started out, still had a little hesitation, so I bumped the jets again and left the meter rod alone. Worked like a charm. I still have some spark plug checking to make sure I don't have a lean range, but good response from top to bottom. Nice smooth day on the water, didn't even lose any parts.

Anyone duplicating this on a Edelbrock 1409 mounted to a 4.3L Vortec V6, don't bother with the 1485 kit. That thing is not even close. Might be good on a pre-Vortec, but is way too lean on a Vortec with a Performa intake. Here's where I ended up

.095 (part#1426) primary jets
.092 (part#1425) secondary jets
.065" x .057" (part number 1461) meter rods
7" pink step up springs


Also ran a new 4 blade Solas 21 inch Rubex prop and that was just about perfect. Nailed 45 MPH at around 4700 RPM. I wasn't playing around much with trim or anything, didn't want to spend much time at WOT with a new motor.

Rick

 

[Volphin]

The calibration kit for the 4.3L is WAY too lean. Here's how I dialed in mine.
1) Edelbrock 1461 0.065 x 0.057 Metering Rods/Pink Springs
2) Edelbrock 1425 .0920 Jets
3) Edelbrock 1426 .0950 Jets
4) Edelbrock 1475 Accel pump nozzle kit. (used .043)

Someone should make this a sticky! LOL

Rick, just saw your post? great minds think alike! Don't forget the nozzle!

 

[Rick Stephens]

The calibration kit for the 4.3L is WAY too lean. Here's how I dialed in mine.
1) Edelbrock 1461 0.065 x 0.057 Metering Rods/Pink Springs
2) Edelbrock 1425 .0920 Jets
3) Edelbrock 1426 .0950 Jets
4) Edelbrock 1475 Accel pump nozzle kit. (used .043)

Someone should make this a sticky! LOL

Rick, just saw your post… great minds think alike! Don't forget the nozzle!

Yup, nearly identical results, ain't that amazing. Edelbrock is 10 years out of date with their 1485 kit. Total waste of money. I never even thought about the nozzle. Dang, now I gotta do more fooling with it.

Thanks buddy!

Rick

 

[Volphin]

I know right? Why would they even bother selling the 1485 kit. Such a waste. What they SHOULD do is package THIS kit.
I got suckered into the 1485 as well when I did my build. It was great at cruise for gas consumption, but the curve was way too lean overall.
Once you get a higher capacity nozzle, you will have no lag whatsoever.

 

[Bondo]

Ayuh,.... Glad ya got it dialed in,....

Funny, the Merc set up, stock was stinky rich,....

 

[Rick Stephens]

Ayuh,.... Glad ya got it dialed in,....

Funny, the Merc set up, stock was stinky rich,....

Really! I would love to know what jets and meter rods they use...

 

[Rick Stephens]

I know right? Why would they even bother selling the 1485 kit. Such a waste. What they SHOULD do is package THIS kit.
I got suckered into the 1485 as well when I did my build. It was great at cruise for gas consumption, but the curve was way too lean overall.
Once you get a higher capacity nozzle, you will have no lag whatsoever.

Makes me want to ***** at em. 1485 is a lazy ripoff. And I can see tuliped valves from running that lean.

Not sure I need the nozzle, more testing will tell. Wasn't thinking about that when I was jetting. From what I understand the 1409 is calibrated out of the box for a 5.0 Liter? That right? I didn't read it from Edelbrock, on a forum somewhere. If so, or even if for a 5.7L, should be plenty of pump in a 4.3. Crazy. Seems like the carb is a mismatched mess out of the box.