Carter AFB... is this a matched set?

[Centerline]

I have two AFB's. Both are for '65 413/426 engines. One is a 3860S (automatic trans) and the other is a 3859 (manual trans) carb. I'm pretty sure both these carbs have the same CFM rating (whatever that might be) I'm just wondering what other differences besides the kick-down there might be such as possibly metering rods or jetting. I'm thinking of eventually using these on a 440 with a Max Wedge style manifold.

 

[lewtot184]

my 65 service manual doesn't show any jetting or metering rod differences. venturi and throttle bore sizes are the same.

 

[Meep-Meep]

The 3859 is for a 65 383 / 413 manual and the 3860 is for a 65 383 / 426 auto. Personally I'd use the exact same carbs for a dual quad app unless you know for sure, or can swap the parts, to make them identical. It's not just a matter of jets and rods but the emulsion tubes (booster clusters). Chances are you will see a different amount, size and location of the holes on the brass tubes on the boosters.

 

[71RR]

This might be the right spot to put my situation on too. My wedge has burned the paint off of the right side valve cover. Car is new to me, and was already built. Could it be too lean, as was the case of my harley back in the carb days, and how would you know which way to go on the metering rods if you richened it up some. The plugs are grey now, but she really bogs on exceleration. Idles good though. I also have 2 edelbrock / AFB 600s. They are new as rebuilt but should I try a little bigger metering rods?

 

[lewtot184]

71rr, cast iron manifolds can run over 700f with everything right. unfortunately there isn't enough info on what you have to give sound advice. the carbs could be correct but the ignition providing too much timing. you don't know the compression ratio or type of pistons. could there be too much advance in the cam (what cam is in the engine?) ? whats the heat range on the plugs and what type are they? what kind of ignition? i just don't want to give bad advice. more information is needed.

 

[62MAX]

I have two AFB's. Both are for '65 413/426 engines. One is a 3860S (automatic trans) and the other is a 3859 (manual trans) carb. I'm pretty sure both these carbs have the same CFM rating (whatever that might be) I'm just wondering what other differences besides the kick-down there might be such as possibly metering rods or jetting. I'm thinking of eventually using these on a 440 with a Max Wedge style manifold.

The only matches sets are those that origionally came on two four barrel applications.

 

[Centerline]

The only matches sets are those that origionally came on two four barrel applications.

Using that logic if you had two 3859 AFB's you wouldn't have a matched set. Or if you purchased two brand new Edelbrock carbs, same part number etc. they wouldn't be a matched set either. I suppose that might be the case if you're looking at things with the blinders of a numbers matching restorer, but definitely not for everyone else.

 

[62MAX]

Using that logic if you had two 3859 AFB's you wouldn't have a matched set. Or if you purchased two brand new Edelbrock carbs, same part number etc. they wouldn't be a matched set either. I suppose that might be the case if you're looking at things with the blinders of a numbers matching restorer, but definitely not for everyone else.

Like I said,matched sets (correct jetting,correct metering rods ,venturi clusters ) came on specific 2x4 barrel applications.If you want to call two of the same number carbs a matched set,have at it ! This ia a matched set,3258 and 3259 from a 62 300H and not for matching numbers restorer,just because it works as it should.

For the sake of keeping eveyone happy I'll add an addition to the above.I guess the term matched set is in how it is interperated,two of a kind with no inward or outward variances,or two of a kind with differences that make them work as designed with no modifications.Either would be a matched set but one would require changes to make them work correctly.Numbers matching restorers has nothing to do with the issue.

And as stated,two 3259's would not be a matched set "if" they were used as intended,both have chokes,identical linkage and all else mentioned,you would have to make modifications to them make work properly.

 

[Meep-Meep]

I have that exact carb set with the 62 383 intake. These carbs were also sold by Ford for use on the Shelby cars.

 

[Centerline]

Like I said,matched sets (correct jetting,correct metering rods ,venturi clusters ) came on specific 2x4 barrel applications.If you want to call two of the same number carbs a matched set,have at it ! This ia a matched set,3258 and 3259 from a 62 300H and not for matching numbers restorer,just because it works as it should......

OK. Read too much into your original answer. I know there may be some subtle differences in my two carbs that will require some massaging to work together properly. Guess a better way of phrasing my question would have been.... can they be made into a "set" and what besides jets and metering rods might need to be changed?

 

[62MAX]

OK. Read too much into your original answer. I know there may be some subtle differences in my two carbs that will require some massaging to work together properly. Guess a better way of phrasing my question would have been.... can they be made into a "set" and what besides jets and metering rods might need to be changed?

you need to get rid of the choke assembly in the front carb,find a progressive linkage that works,probably not much you can do with the venturi clusters and probably won't make much difference.Jetting is most important,I would get the specs from a set of 69/70 Hemi carbs and go from there.keep in mind the carbs you are planning on using have the same size primaries where as the Hemi carbs primaries are smaller.I have all the specs for all the 2x4 applications,rod and jet size both,if you decide on any particular one,let me know and I'll send you the spec sheet,it's a place to start.


Bill

 

[Centerline]

you need to get rid of the choke assembly in the front carb,find a progressive linkage that works,probably not much you can do with the venturi clusters and probably won't make much difference.Jetting is most important,I would get the specs from a set of 69/70 Hemi carbs and go from there.keep in mind the carbs you are planning on using have the same size primaries where as the Hemi carbs primaries are smaller.I have all the specs for all the 2x4 applications,rod and jet size both,if you decide on any particular one,let me know and I'll send you the spec sheet,it's a place to start. Bill

Thanks for the offfer. It will be a while as we are moving to Texas and I need to build a garage first.