Carter Carb question

[lexxman]

Hi,I was just looking over the carb that was on my 383 when I got the car.In the  manual it list it for a 383 auto(witch I have)with A/C only.(witch I don't have).What would be the difference?Any help would be great.

Thanks

[A383Wing]

Probably main jet size and metering rod size...if it runs fine with the carb now, leave it alone

[71bee]

yup. more than likely, it's a simple metering rod size. you shouldn't notice any difference in performance.

[Dans 68]

The Carter part number you want is the 4401, for an automatic transmission. The manual transmission takes a 4426. Interestingly the one you probably saw, for an A/T A.C., is part number 4635. The #4401 and #4635 both take the same rebuild kit so you can draw your own conclusions. 

Dan

[resq302]

The rebuild kit is only the accel pump, check balls, and gaskets and such.  Rebuild kits have nothing to do with metering rod or jet sizes.

[Dans 68]

Agreed, but I was referring to the carb overall dimensions/shape/envelope that require the accell pump, check balls, gaskets, etc. that are in a rebuild kit. They are probably the same basic unit with the exception of the internal metering mechanisms. The 340 A/T (#4425) and 340 A/T A.C. (#4636) carbs use the same rebuild kit number also. I'd be interested to learn why there is a specific carb for an A.C. optioned engine. AFAIK the carb for a 383 4-bbl 4-speed A.C. car (albeit rare beast) is the same as without.

Dan

[dodgedarren]

Not to hijack this thread but I have a carter carb question too. I have rebuilt 440 with Edelbrock Performer
top end kit which includes intake, heads cam. I'm running a Holly 750 and she runs great. Issue is I burn
through allot of gas of course and please don't beat me up on this but would putting my stock carter back on
make a noticeable difference in fuel economy?? I live in a small beach community so I really don't have many opportunities to open her up so 90% of my driving is crusin'

Darren

[71bee]

Not to hijack this thread but I have a carter carb question too. I have rebuilt 440 with Edelbrock Performer
top end kit which includes intake, heads cam. I'm running a Holly 750 and she runs great. Issue is I burn
through allot of gas of course and please don't beat me up on this but would putting my stock carter back on
make a noticeable difference in fuel economy?? I live in a small beach community so I really don't have many opportunities to open her up so 90% of my driving is crusin'

Darren

Not to beat you up Darren, but why did you add all those goodies to your engine if you only wanna go cruisin'?  

All 440 HP engines should run at least 750 CFM carburetors. you can get away with swapping out a few jet sizes here & there, but you may notice some hesitation on throttle response & possible "lean burn" back firing. if you put your stock Carter AVS back on, then you should be fine. sounds like you were running a Holley 4150? those babies always suck a ton-o-petro.

[lexxman]

The carb I have is #4638sa.I will need to get a rebuild kit for it,and the 4bbl flaps are stiff. The whole thing car and engine was sitting in a barn for about 5 years. I've haven't played around with carbs before so this will be a new thing.I also have a holley carb(I can't find a number on it).I hope to start the engine on my vacation in December.

Agreed, but I was referring to the carb overall dimensions/shape/envelope that require the accell pump, check balls, gaskets, etc. that are in a rebuild kit. They are probably the same basic unit with the exception of the internal metering mechanisms. The 340 A/T (#4425) and 340 A/T A.C. (#4636) carbs use the same rebuild kit number also. I'd be interested to learn why there is a specific carb for an A.C. optioned engine. AFAIK the carb for a 383 4-bbl 4-speed A.C. car (albeit rare beast) is the same as without.Dan

Dan if you have the 69 shop manual in the first pages of the fuel section is where they list the carb number and witch engine it would be on.

[Dans 68]

Thanks, Lexman. I see the explanation in the '69 FSM, but the '68 FSM has no such critter (hot idle compensator) mentioned for the '68 Carter AVS's. I guess they realized that the addition of an A.C system, on a hot day especially, caused a few problems at idle. So I still wonder....    

Dan

[lexxman]

This will be an education for me,but the section for id and use read like a legal contract. This for that ,but not this and only with that. :lol:The thing hasn't ran in years ,so it will be interesting to see what happens.

[71bee]

The 4638S originally came with .101 primary jets, .089 secondary jets & #16-574 metering rods (econ: .065, mid: .064, power:.058).

If your car came equipped with auto trans & 440 HP only, it would have had a Carter AVS #4429S. it included .101 primary jets, .089 secondary jets & # 16-574 metering rods. looks like they are basically the same carb. probably only had a different number for factory reasons(?)