my carb jet / rod program had an error in it. my son has fixed it now. i checked it out. and it is fine. if you want to check jet to jet only, enter .000 for the rods. and with rods and jet change, it will calculate changing jets and rods at the same time. you cant guess a change of both at the same time. http://clarkehackworth.com/files/JetsAndRods.html

 

Here is some tuning help....
http://www.carburetor-parts.com/AFB-...ts_ep_298.html

http://documents.rasoenterprises.com...terAFB-MRJ.pdf

http://www.raylinrestoration.com/Tec...B%20Tuning.pdf

 

very good addition Bob. i have some of that info in some very old Carter books. but do remember my program will not tell you what size of jets and rods to run. it will tell you the amount of change you are looking at. only you can decide the amount of change.

 

It was very hard back when we did not have computers to get information on tuning these carbs... We had to learn on our own.
Here in So-CAl we had a lot of help. But I could never afford to pay for it, So I learned by trial and error. Man was that fun...
Now soooooooooo Much is on line.... It's such a great tool !!!!

 

good point Bob. in 1968 i got a Carter sheet of all at that time jet and rod dia with part no. and some Carter books. some of my most highly praised items. one thing i found out, is that the float level WILL effect the over all fuel flow. i know the books say not, but my 300 L 413 , AFB liked 5/16" float level much better than the called out 7/32".. so i stopped there. and i found out that a little IS a lot.

 

Do you remember some of the carter competition tuning books Moe?
I do still have some OEM books i refer to every now and then.
I think I have forgotten allot now that I dont work on them as much. But I still get the job done when needed.
I just gave away and older Carter Tuning Strip Kit, To a carb rebuilder buddy up the street. He needed it to do a GTO that has a set of Dual AFBs / AVSs on it!!!
I use to have like 3 of those kits....lol

 

i have lots of chrysler service manuals. and motors brand. and a few Carter books. you are right nothing can replace them. my time right is short right now.. latter to night ill drag the Carter books out and list which ones i have.

 

my most prized item from Carter AFB-STEP-UP RODS & METERING JET SIZES. single page. May 1968. REWORK CARTER AFB 4 BARREL. with part numbers. next CARTER competition series book. logo on the front cover. 20 some pages listing the AFBs as to which engines to put them on. and half page showing the VW bug spray 2 bbl carb. and a page with a short list of jets and rods. two pages with the fuel pumps electric and manual. form 3209, jan 1971. and a second book like the other. some parts list. and the competition series list. march 1969. form3878. next is the Chrysler parts HI-PERFORMANCE PARTS. NOT: DIRECT CONNECTION. OR MOPAR PERFORMANCE. in side the cover is a page with sox and martin supercar clinic. with pics of their 67 GTX. dick landy on the next page. many pages of race parts. on page 9 is a pic of the hi performance single ext for the 1964-65 hi performance 273. with pat numbers. sorry its so long.

 

Those sound similar to the ones I use to have....

 

ye sounds like you have the same ones i have. not only do i have the sox and martin supercar clinic booklet. i have the a blue and white supercar clinic nylon jacket with the little red hart with a tail. has only been put on 3 times.

 

I noticed the same effect on my avs. It likes the float higher

 

yep you are on to something. the lower float level lets the fuel to flow sooner. the reason i started to play around with the level. i noticed that the AFB sheets listed a number of different levels for diff engines. so i thought adjusting the level some might be safe if done with care. i have never went lower than 5/16". of course if you go to low the fuel will flow to soon. like i have said before with carbs, a little is a lot.

 

It was a trick we did in the 90s late 80s ...noticed the same on the rebuild sheets
and so true on a little is alot MOE .
With my 650 avs frm eddi
I have been from one end of the tunning graf to the other 12% rich 12%lean primaries ,secondaries...tight air valve loose air valve I have the tunner kit .plus 3 sets of rods and two sets of jets
what my motor likes is the lean side of the tunning charts acept for the accel. Pump. And bouncing between losser air valve setting and a richer set of jets
She tends to like 3% lean tight air valve or 3 % rich loose air valve
velosity plays a roll in tunig her.