Converting a 383 four barrel to a six pack

[Mopar Nut]

Has anyone tried this? Pictures and thoughts.

http://www.dodgecharger.com/forum/index.php/topic,16704.0.html
http://www.dodgecharger.com/forum/index.php/topic,59318.0.html
http://www.dodgecharger.com/forum/index.php/topic,22752.0.html
http://www.dodgecharger.com/forum/index.php/topic,17641.0.html

[Cooter]

Hmmmm, 383 C.I.........1350 CFM........

[Mopar Nut]

I can get a complete unused set up without the fuel line for $500.00. Being that cheap, you can spend the rest on the engine. The carbs are worth more than that.

[XH29N0G]

 

Just curious to know the answer to this because the six pack threads seem to show that a well set up system on a 440 does very well and can be manipulated for gas mileage and performance.  With a smaller engine will it really overcarburet it that much?   There is also a difference in the way the CFM ratings are calculated for 2 bbls, but I don't know whether that is still too much.  Assume it might be, but given some other discussions I see arguments for high CFM carbs on 383s. 

[JB400]

I'm curious as well.  I wonder if it'd be better to use 3 350cfm carbs instead of 1 350 and 2 500cfm carbs.  Of course, you'd have to make the proper changes to the carbs to where they'd perform the same as the 500 cfm carbs.

[mauve66]

worked fine for me, 10 mpg, 3.91 rear, auto, everyday car for a year, make sure you get the kickdown linkage set right, i hand ported my 66 iron heads (smoothing mainly and port matching) plus a bigger cam than stock,

[heyoldguy]

I ran a 6-pack on a 383 in a '69 Road Runner with 3.55 gears and got 7 mpg. After two weeks of tuning it was up to 16 mpg. Put the engine in a Challenger with 3.91 gears and got 17 mpg on the hiway and the wife would get 19 mpg. The 1350 cfm converts to about a 950 cfm 4-bbl, but you are generally running on the center 350 cfm carburetor. Works out great for fuel economy.

[Mopar Nut]

worked fine for me, 10 mpg, 3.91 rear, auto, everyday car for a year, make sure you get the kickdown linkage set right, i hand ported my 66 iron heads (smoothing mainly and port matching) plus a bigger cam than stock,

Where did you connect the power brake booster vacuum line? Center carb? Manifold?

Thanks for the picture.

[Mopar Nut]

I ran a 6-pack on a 383 in a '69 Road Runner with 3.55 gears and got 7 mpg. After two weeks of tuning it was up to 16 mpg. Put the engine in a Challenger with 3.91 gears and got 17 mpg on the hiway and the wife would get 19 mpg. The 1350 cfm converts to about a 950 cfm 4-bbl, but you are generally running on the center 350 cfm carburetor. Works out great for fuel economy.

Thanks, this is great information. I decided to buy the set up. He found the fuel line pieces. The guys 383 is getting pulled and replaced by a crate engine.

[mauve66]

worked fine for me, 10 mpg, 3.91 rear, auto, everyday car for a year, make sure you get the kickdown linkage set right, i hand ported my 66 iron heads (smoothing mainly and port matching) plus a bigger cam than stock,

Where did you connect the power brake booster vacuum line? Center carb? Manifold?

Thanks for the picture.

the back of the manifold has an opening for a pipe fitting for the brake booster

[mauve66]

other vaccum routing, i had the dist dis-connected at the time of this shot, its hanging down by the valve cover with a bolt in the end of it,  everything hooks up just like the 440 just smaller versions

[Mopar Nut]

worked fine for me, 10 mpg, 3.91 rear, auto, everyday car for a year, make sure you get the kickdown linkage set right, i hand ported my 66 iron heads (smoothing mainly and port matching) plus a bigger cam than stock,

Where did you connect the power brake booster vacuum line? Center carb? Manifold?

Thanks for the picture.

the back of the manifold has an opening for a pipe fitting for the brake booster

Thanks

[Mopar Nut]

other vaccum routing, i had the dist dis-connected at the time of this shot, its hanging down by the valve cover with a bolt in the end of it,  everything hooks up just like the 440 just smaller versions

These are some great pictures, I really appreciate you taking the time.

[Mopar Nut]

What about the Kickdown linkage, is it the same as the four barrels.

[mauve66]

the stock 66 linkage wouldn't work, a friend of mine grab a later 440 vertical rod (runs up the back of the block)  and we got more extension out of it

[Mopar Nut]

Just picked up the six pack and everything but the kickdown linkage. Everything was still in their boxes. Thanks for all of the information, helped out a lot.

Now I need to find the linkage for the transmission.

[dstryr]

http://a12mopar.com/yabb/YaBB.pl?num=1319504672

Maxwellwedge:I would say everything from the bellcrank down to the trans is the same. The piece from the bellcrank to the carb is where the difference is. I could not find the parts in a 69 book but the 70 book shows something.

http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Board=QuestionAnswer&Number=6426190&Searchpage=1&Main=6426160&Words=+1_WILD_RT&topic=&Search=true

These might help you out.  I didn't read completely through the top one.

[469 runner]

Hard to beat the coolness factor and eye appeal of a six-pack setup.  Though, I believe a well set up four-barrel would run better.  I tried going to a six-pack on my 440 and was disappointed, went back to a Holley 3310.  Better mileage too.