Jet sizes for six pack

[dan juhasz]

Does anyone know what the stock jet sizes were for the center and outboard carburetors.

 

[Northwoodsbee]

This guy helped me. Seemed very knowledgeable.

ALLSTATE CARBURETOR & FUEL INJECTION

143 Brightside Avenue
Central Islip, NY 11722

Phone: 631 234-8327

Email: [email protected]

 

[PurpleBeeper]

Depends on year/trans

 

[dan juhasz]

List 4392, 4393,4394. I searched online came across a jet chart by lust number and the 69 six pack carbs are not listed. Auto trans

 

[33 IMP]

Well first, no Jets in the secondary carbs stock. Metering plates..

 

[33 IMP]

I have the same carbs on my car. Center carb jet in mine is a 65 (I think original jet was somewhere around 63-65) and a previous owner drilled out the metering plates to the Mopar engine book specs. I don't recall how big..... but bigger than stock.
And I have the same holley list chart, with several hundred carbs listed, but not ours.

 

[1968rt]

Take a look at this chart. It will show the jet size equivalent to the metering plate.....for the outboard carbs.

 

[dan juhasz]

Take a look at this chart. It will show the jet size equivalent to the metering plate.....for the outboard carbs.

View attachment 1705090

excellent thank you

 

[33 IMP]

I wonder what in the world used a #42 metering plate? (95 jet?!?). The big three barrel maybe ?

 

[Bird 426]

My #41 metering plates are not the same size on both sides. These are from my small block stroker, originally a 340. Seems like they wanted the left side richer than the right.

 

[70sixpkrt]

Stock jet size in the center carb was 62. Outboards did not have jets.

 

[BSB67]

My center carb came with 62’s.

 

[Bird 426]

Fuel pressure is critical in this whole thing. Something I fought for 3 years until I found that my rich condition was caused by 7.5 psi, 5 psi and float level adjusted changed everything.

 

[RJRENTON]

Fuel pressure is critical in this whole thing. Something I fought for 3 years until I found that my rich condition was caused by 7.5 psi, 5 psi and float level adjusted changed everything.

No it's not.....On my RS23V0A****** 1970 GTX (original six barrel car), I don't worry about fuel pressure, as the in line vapor seperarator, tends to relieve excess pressure. I run the liquid fuel level slightly BELOW the sight plug opening on all 3 carbs. I also stagger the end carbs to get better fuel distribution.....the plugs will show the evenness of the fuel distribution by coloration. I use the PROMAX setup with the removable Holley jets....size of jets to be determined by you......experiment .........
BOB RENTON

 

[Bird 426]

Oh I did experiment! I too have all of the Promax parts, except the center carb. For me, lowering the fuel pressure changed everything. Fuel bowl levels, power valve and jetting. I had gotten very discouraged after reading all of the info on how to tune a 6-pack. All of the do this, don't do that and blah blah blah disinformation, its a starting point. My spark plugs are now readable, now I can start over . I do not have a fuel vapor separator. Sometimes what works here, doesn't always work over there. I am just happy that I found out why nothing I did changed my overly rich condition.