Tuning a carb with rear jets

[CFMopar]

So I bought the conversion kit for my 3310 so I can jet the rear. Wonder where you start and how do you go about tuning with 4 jets now?

[Chryco Psycho]

this will help http://www.cuda-challenger.com/smf/index.php?topic=822.0
start jetting the front while cruzing , then make a full throttle pass & wastch for a color change in the plugs

[CFMopar]

If im running 73s on the front any idea on what would be a good starting point for the rear?

[CFMopar]

Oh one more thing. Is it commen that you could suck the rear fuel bowl dry? Some guy was telling me this but I couldnt see it happening...

[Chryco Psycho]

I would start with around 80 rear jets with no power valve in the rear , if the fuel pump is up to the task it will not starve

[CFMopar]

Im sure the fuel pump is good to go.

[firefighter3931]

I would start with around 80 reaqr jets with no power valve in the rear , if the fuel pump is up to the task it will not starve

78-80 sounds like a good starting point for the rear.

Ron

[CFMopar]

does it matter which plug you pull to check the jetting? Can I pull number one while tuning the rear jets? number 1 is just so much easier to do when the engine is hot

[Chryco Psycho]

yes, all the pllugs should be affected by the secondary being opened fully 

[Ghoste]

Does your jetting recommendation matter what the the combo is?

[Chryco Psycho]

yes but it is a place to start from that should be close

[Ghoste]

Okay thanks.  I should have been more clear with the question as to asking if the INITIAL jetting recommendations were the same regardless of combo but I think you knew what I meant.  In any case, you still answered it.  You prefer to start fat and lean out or in the middle and go whichever way dictates?

[Chryco Psycho]

I prefer Fat , it is safer , But I generally start at factory settings & adjust from there , adjusting more than 5 sizes usally indicates you have other problems 

[Ghoste]

Where Thread Marshall is starting on the front, is that also what you would recommend?

[Chryco Psycho]

you can jet the front at part throttle / cruising , the only way to jet the rear si wide open so you need to have the front dialed in first

[Ghoste]

A good starting size on the front would be?

[Chryco Psycho]

what did the carb come from the factory with ? start there

[Ghoste]

71's I believe.  I have it written down out in the shop.  In any case, that's where I'll start and thanks again.