Difference between CARTER AVS with Manual and Auto Trans??

[chaps70rt]

Just wondering if anyone out there has successfully installed a Carter AVS that was originally built for an A/T transmission and used it for a manual transmission??   There seems to be more A/T carbs available.   What is the difference?

Example:  4737 Vs 4738

I am looking for an original Carter AVS for 70 Challenger 4-speed.   Need to go stock due to shaker set up that won't fit.

Thanks  .... CHAPS

[Road_Runner]

Just wondering if anyone out there has successfully installed a Carter AVS that was originally built for an A/T transmission and used it for a manual transmission??   There seems to be more A/T carbs available.   What is the difference?

Example:  4737 Vs 4738

I am looking for an original Carter AVS for 70 Challenger 4-speed.   Need to go stock due to shaker set up that won't fit.

Thanks  .... CHAPS

Used to run a carter AVS on my 383 A/T Roadrunner, the A/T version has provisions for kickdown linkage.  As far as I know that's the only difference.  Should be easy to use a A/T version on a manual car, but would have to scrounge up the kick-down adapter to use a manual version on a A/T car....

That's the limit of my knowledge though, so if there is more of a difference someone else will have to chime in..

Later, Jim

[chaps70rt]

Thanks Jim .... that is helpful.  I am told that the M/T version had a dash pot on it also.  It helped the car from stalling or something when dis-engaging the clutch?? 

I am in search of a M/T version for my 440 4-BBL.   If anyone out there has one, please let me know.

Thanks .... CHAPS

[femtnmax]

One comment said the manual trany AVS included a hot idle compensator bi-metalic valve.
http://www.dodgecharger.com/forum/index.php?topic=12070.0;wap2

A tech article said to block off the idle compensator valve because they can  open/close at wrong times and mess with calibration to today's pump gas.   So I did this to the one I have, which is for a 440 manual trans, don't know the year right off hand.  I noticed the floats rode alot higher in today's fuel, so the fuel level in the bowls was too low.  I adjusted them as far as possible but it still wasn't enough to bring the level to the stain marks on the float bowl.  I tried adding some strap-on weights to the floats, but that idea will need more tinkering if it will work at all, maybe not.

On my 360 4speed Ebody the 440 AVS carb had great top end performance, but I could not get it sorted out for around town/part throttle cruise at my elevation 4500 feet.  I want to tinker with it some more, I think it has potential.

Dashpots??  My 340 with auto trany had the thermoquad carb, and had a dashpot that limited how fast the primary throttle plates would close to keep the engine from stalling during fast deceleration.  I thought the auto trany cars had the dashpots, not the manual trans.  Don't know for sure.

[Road_Runner]

I will add that the 383 ran fantastic with the AVS with two exceptions: first it had a nasty habit of 'coughing' (don't know what else to call it, wasn't really a backfire) when I floored it during launches.  It wouldn't die completely, but the RPMs would drop to around idle and then I'd have to build back up from there.  The only time I ever lost a street race it did this and the big block Nova was too fast for me to come back on.  I had the last laugh though because when I asked for a re-run the Nova driver had blown his engine and asked for a ride back to town!  Secondly, it was only a 625 cfm (I think) and I had to go to a bigger carb when I built my motor with more cam, compression, etc.  But for around town driving, the throttle response was crisp with the AVS and perfect for the street.

Later, Jim

[Aussie Challenger]

From my experience the auto carb's had the kickdown provision, different vac advance, that is working at idle, manuals didn't usually and sometimes slightly richer settings.