The Dodge Challenger Message Board

Here is a magazine article covering tuning on the six pack.

Expolded view of six pack carbs.

Six pack jetting tips for the 440 engine from Mopar Performance.
Key:
MMO = Main Metering Orifice (bottom of metering plate)
PVCR = Power Valve Channel-Restriction

For the 440-6 bbl with a cast iron intake manifold with air cleaner and no modifications to the engine, the following re-jetting is required:

---------------------------------Throttle Side ----Diaphragm Side
Front Carb - MMO-------------- .093 drill----------- .089 drill
Center Carb - Jets ---------------#64 ----------------#64
Center Carb - PVCR ------------.052 drill---------- .052 drill
Rear Carb - MMO------------------ .093-------------- .089

For the 440-6 bbl. with cast iron manifold and the manifold heat blocked, with air cleaner and no other changes, the following re-jetting is required:

--------------------------------Throttle Side------ Diaphragm Side
Front Carb - MMO------------- .089 drill------------ .086 drill
Center Carb - Jets --------------#63------------------ #63
Center Carb - PVCR----------- .043 drill------------ .052 drill
Rear Carb - MMO ---------------.093 drill------------ .083 drill

When using the standard aluminum Edelbrock 3-2 bbl. manifold on the 440 with Holley carbs with air cleaner and no modifications to the engine, the following re-jetting for maximum off-road performance is required:

---------------------------------Throttle Side --------Diaphragm Side
Front Carb MMO---------------- .089 drill-------------- .089 drill
Center Carbs - Jets-------------- #63-------------------- #63
Center Carbs - PVCR---------- .043 drill--------------- .052 drill
Rear Carb - MMO--------------- .093 drill--------------- .086 drill

For the above Edelbrock manifold system with the manifold heat blocked, with air cleaner and no other changes, the following re-jetting is required:

----------------------------------Throttle Side------- Diaphragm Side
Front Carb MMO---------------- .089 drill-------------- .089 drill
Center Carb Jets----------------- #63-------------------- #63
Center Carb PVCR----- --------.041 drill--------------- .049 drill
Rear Carb MMO----------------- .093 drill--------------- .093 drill

Jetting tips for the 340+6

If a completely stock system try increasing the jet size on the centre carb up to #63 each side (manual trans) or #64 (automatic) but leave the outer carbs alone.

If a stock Aluminum Edelbrock Manifold;

----------------------------------Throttle Side--------- Diaphragm Side
Front Carburetor MMO------------- .086----------------------.073
Center Carburetor Jet-------------- #63---------------------- #63
PVCR--------------------------------- .046--------------------- .046
Rear Carburetor MMO--------------- .086-------------------- .073

Same as above but with heat cross-over blocked;

------------------------------------Throttle Side-------- Diaphragm Side
Front Carburetor MMO-------------- .086--------------------- .073
Center Carburetor Jet-------------- #64---------------------- #64
PVCR--------------------------------- .046---------------------- .046
Rear Carburetor MMO----------------.086--------------------- .073

Somehow I managed to miss this excellent post

Not only is it all there, but I actually understand it

I've printed off all the Six Pak info and filed it ready for rebuild time.

Thanks Dave

No problem Tony.