426 Hemi carb jetting

[Sonny Black]

running Arlin Vanke intake, 426cid...2- 750cfm 3705 carters
what I want to know, does anyone know what jets came in a
3705?....

560cam...3" headers, some head work.

no strip anymore...just street

thanks,

Sonny:sunny:

 

[RustyRatRod]

Sonny, I bet The Carburetor Shop can tell you.

http://www.thecarburetorshop.com/index.htm

 

[Meep-Meep]

The throttle bores and venturi area on the 3705 is similar to the Eddy 750. So if all else fails you can start there and be in the ball park. See charts on pages 17 and 25 -
http://www.edelbrock.com/automotive_new/misc/tech_center/install/1000/1407_manual.pdf

 

[Sonny Black]

thanks meep, rusty ...also could use a few more ideas on what people are running for jets...
again thanks,
S:sunny:


we're getting the old hemi on the road again..I'll follow with a few pictures.

 

[coloradodave]

Sonny: Specs for the 3705-S Carburetors:
Gotta qualify this: These specs are from my 63 Super stock guide: May or may not apply to the later Hemi.

Primary main jets: .104" (120-161)
Secondary main jets: Throttle side: .089" (120-159)
Choke lever side: .063" (120-176)
Metering rods: .066" X .053" (16-76)
Float setting: 7/32"

Remember, these were for the super stock race motors.

 

[RustyRatRod]

104 primaries. LOL

 

[Sonny Black]

here's a few pic's of the 67 R/T ....

:sunny:Sonny, Tommy & few others have been messing with this beast almost 40 years!!!!

 

[RustyRatRod]

That's a nice un Sonny.

 

[coloradodave]

RustyRatRod;909787082 "104 primaries. LOL"

Yeah Rusty, sounds huge until you deduct the metering rod area from it...............

 

[RustyRatRod]

I was laughin cause that's what they take stock on the primaries. Phat. LOL

 

[Meep-Meep]

RustyRatRod;909787082 "104 primaries. LOL"

Yeah Rusty, sounds huge until you deduct the metering rod area from it...............

Or factor in the larger venturi area.

- - - Updated - - -

Damn Sonny! I mean, WOW!

 

[Pops1967GTX]

Sonny has one beautiful :headbang: machine....

 

[Hemirunner]

The jetting is obviously going to vary depending upon engine cid, intake, cylinder head, compression, camshaft, air density and humidity and your altitude lol.... the only useful info you can really hope to gain here is the original factory jetting combo for the 3705 and tune from there. This took me a whopping 30 seconds to find on the interweb lol....

"One thing that had us worried was the carburetor jetting. The original service documentation showed the carburetors should be heavily cross-jetted. For example, the AFB 3705 carb is supposed to be set up with a .089 secondary jet on the throttle side and a .063 jet on the choke side. Our Edelbrock carbs were square jetted with .101 jets on each secondary. So we were 12 jet sizes larger on the throttle side and 38 jet sizes larger on the choke side! That didn't feel correct, but we couldn't find anyone else who had run the Edelbrock carbs on this manifold, so we crossed our fingers and fired up the motor. Much to our surprise, the wide-band sensor told us we were right in the ballpark for average A/F ratio, and the individual cylinder EGT probes showed only moderate differences from cylinder to cylinder.

Since the out-of-box carb jetting appeared to be within a reasonable range, we proceeded to make some full-throttle pulls. The best numbers we recorded over the course of several runs was 625 hp at 6,300 rpm and 610 lb-ft of torque at 5,400 rpm. That gives us a nice 200hp gain over the original Max Wedge motor-not too shabby! No doubt the larger displacement is responsible for a big part of the increase as are the high-flowing Indy heads."

Read more: http://www.moparmusclemagazine.com/...wedge_engine_build/viewall.html#ixzz27xzPFVhK
​

 

[Sonny Black]

thanks Hemi r' that is exactly what we were thinking. I know U can surf for info BUT it can't hurt to ask here. I find the info here to be the best of this type of format. I read the other threads and
"steal the knowlege" and have used it many times to Diagnose & allow them to be used for specific purposes.
also,http://www.moparmusclemagazine.com is great reading.

thank you,
sonny