I am new to the Holley carbs always raced T Quads. I have been working on our restored V code Cuda have it running good now.
I am starting to work on the 340 for my D/S TA. I am going to put QFT billet metering plates on the end Carbs. I need to buy a selection of jets. I have 62's-68's for the center carb, I am thinking 80's-86's for the ends. I don't want to buy a whole bunch of jets that are gonna just sit in the box. I want to be in the ballpark. What do you guys think? Also is there a difference in jets from different companies?

Thanks, Rod

I like the BLP jets

Will the billet metering plates pass tech?

Login to classracer.com. Knowledge peeps there and even a specific stock/super stock tech section. Hint: Don Little is a 6-bbl guru! So is Steve Wann...

I have known Stevie Wann and Chicken Little for decades. I have raced Stock Eliminator on and off since 1973 all with Stick Shifted small blocks. Many time NHRA record holder. I was even in teardown when Cab got bounced for sand blasted heads.

That intake was glass beaded, it had the wrong carbs on it also The heads went through tech. fine
Call Gene, he made his 340 fly 6 pack fly

You have known Don for years if you call him "Chicken" too!!

Ooooh, Cab you cheater...lol

I know why Gene's car flew and that engine would not pass current tech.

A small block E-body in D. That's brutal!

I am guessing you would be time and perhaps money ahead if you purchased some carbs from someone who has been there and done that. A lot of good knowledge here but you need to be on Classracer.com also.

Please keep us posted on your progress.

Good Luck!

Bill

I thought the hp factor had them in C.

Edit- I just looked it up...... "D" for a stick, "C" for an auto.

3480lbs with driver...... Nominal.
D stick can be as light as 3440.
C auto can be as light as 3360.

Just think Dwayne, you could NEVER get a D/S car to fly with a head as bad as a Pontiac has? Just think what the Mopar head could do?....lol

I am on Classracer. No one has ever been able to make the 340 six pack competitive with a stick very few have made them work with a slush box. Steve Hahn tried in the 70's Farmer is struggling with his McCoy has a F/S but it is slow.
The TA stick combo is a natural E/S car the AAR is a natural F/S. I want to go knock heads with the Z28's current record is 10.27 set in mineshaft air. A few years back my 72 Low compression ran 10.80's in F/S in not so good air.
Buying someone else's Carbs is not the answer. I have loaned people my Thermo Quad and tried theirs and we both slowed down. I expect the Holleys to be the same.
What I was looking for in my post was a general range of jets to get as a starting point. I have collected several carbs but few parts. The BLP jets look like a good way to go just looking for jet sizes.
Thanks, Rod

You're right...... I don't know what I was thinking.
The AAR is 10.37 auto(319hp), 10.61 stick(312hp)........ E and F.

I think the challenge is to get the 6bbl to leave hard with a clutch and a small motor.

If you go w/BLP, use their conversion chart which compares holley jet #'s to get you close then tune from there. I'm not a 6-pack guy so no help there..........

Did the 6-pack have a better cam then the 4 barrel? I think the biggest advantage is the hood. What rpm did you get out of the 340, where did it fall off? Picking your brain for my combo. 70 Duster 340 avs. Why would the stick be rated more hp then the auto? Good luck

When I used to run a 440 6-bbl (both my Challenger and Road Runner had 'em at one time) I had home-modified outboard plates to allow using "real" jets. Not sure what a Stocker 340 would want compared to a street/strip 440, but I'd say have 62-68 for the center carb and 76-84 for the outboards. Even that will likely leave you w/ some jets that never get wet... but it should cover you across a pretty wide range of conditions if you'll be traveling around to different tracks.

In addition to Holley jets, I have the COMP MaxJets because they have smaller increments between jet #s and IMO can be better fine-tuned. They're similar in many respects to the BLP jets, too. Both the MaxJets & BLP jets are sold by drilled hole size and use a cross-reference chart to match them as closely as possible to Holley jet #s.

Good luck! Me luv Challengers with T/A hoods!

No help on the 6 pack, but BRad, thats looks great!

The difference between the 4bbl and 6 Pack is just a tick more compression .004 thinner head gasket. NHRA allows the hood on both combos. The TA hood works. The AAR hood is just lighter.
I routinely ran my 72 340 to 7500 and a few times to 7800 in kill mode. The person to talk to about the AVS combination is Chuck Beach even though he runs an Auto (known him since the 70's when he had a stick in the same car).

Never a problem getting a stick car to leave. 7000rpm, Youngblood clutch, Cal Tracs and Hoosier tires.

This is exactly what I was looking for. Thank You Brad

H
Thank you for those answers, now that we can run solids, maybe more rpm is possible. Picked up a LD340 at Carlisle, more open inside then the stock cast iron one, lighter too. Will you use the Jerico, what type clutch-flywheel? Wish I could row one. Mike

The auto is higher than the stick.

Nhra looks at the auto and stick combos individually....... And apparently someone was running "too quick" with the auto combo and got it hit.



So, your stick combo 60's as good as the auto?

The guys I know running sticks very very rarely 60' as well as a similarly preppared auto.

[/quote]
Thank you for those answers, now that we can run solids, maybe more rpm is possible. Picked up a LD340 at Carlisle, more open inside then the stock cast iron one, lighter too. Will you use the Jerico, what type clutch-flywheel? Wish I could row one. Mike [/quote]

I doubt the solids will make any difference in RPM over what I am running. The people I have talked with say the LD340 didn't add HP but was worth it for the weight off the nose. I have run a Jerico since the 80's. Rob Youngblood of Advanced clutches in Idaho is the person to go to for those needs. Once you have driven a stick you would never go back to a slush box.

[/quote]
So, your stick combo 60's as good as the auto?

The guys I know running sticks very very rarely 60' as well as a similarly preppared auto.
[/quote]

My F/S Demon consistently ran 1.40 - 1.43 60ft. But are we racing 60 feet or 1/4 mile?

Well apparently this is far from your first rodeo, but it surprises me those metering plates are legal. This is what the rule book says:

CARBURETOR
Must be correct year, make, and model specified for car’s engine;
fuel or air bleed passages may be resized. Drilling idle holes in
primary throttle blades permitted. Other modifications prohibited.
Sandblasting, grinding, flash removal, dry film coating, or any other
modification to carburetors prohibited. Replacement carburetors
permitted provided they are same model, type, throttle bore, and
venturi size. Computer carburetors use latest model non-computer
carb for engine application.

Are the plates just something they allow?

Good Luck,
Bill

Rod how you been. Jerry Davis is working on the same combo, auto not stick and having to work to get the carbs to respond. Give him a call, if you need his contact info PM me and I'll give it to you.

Ray Buckner

I was reading on Class racer where holly jets where made to work in a TQ in stock and all kinds of changes are made to the AVS thanks to Mr Beach. Talked to a well know guy on the east coast about these "changes" A good carb runs $2000 up now.

You're the one who said the 340-6 stick combo wasn't that competitive, and that's it's no problem getting one to leave.
We don't race to 60'....... But it does start there.

1.40-1.43 60' out of that F/S are pretty good short times for a stick IMO.
Better than my friends D/S, E/S combo.

Forgive me but can't you still but a holley jet kit 62-99 for like 40 bucks?

Hi Ray long time no talk. If Jerry hasn't changed his number I still have it.
Thanks, Rod

I didn't say it wasn't competitive I said few people have made it work and to my knowledge no one has made it work with a stick. There is one very quick auto that went 10.47 at E weight at Indy. The stick and slush box cars work very different. Radial tires won't take the hit of a stick launch but really help an auto.

They are more concerned about modifications that make the carb flow more air not about adjustability.

Rod, are you really sure you want to do this again
Not me, S/P and S/G are bad enough now
Do you know where your old Demon is now?
That car ran good for you and Gene

My first Demon is in Sweden My last Demon I sold to Riddle and Ken Etter destroyed at Fontucky. If I could stay away from the races, I wouldn't have the bug. I went to the Fontucky points race and helped Mazz and Etter. Etter won Super Stock.
I miss the wheel stands and pulling the gears and the challenge of going fast within the rules. It is a disease for which there is no cure!

Looks like the 340-6bbl, at least the auto's, have had some power taken off them at some point.
I was looking through an old "nitro joes" stat books(2010) and saw where they used to be factored at 328hp, now it's 319hp.

The 340-6bbl stick is now rated/factored at 2hp less than the 71 340-TQ...... 312 vs 314.