Topic: Autolite 4300 ZF-D

[ruppstang]

Here are some pics of our Autolite 4300  C8 ZF-D. Did we miss any thing?
Marty

[Hipo giddyup]

Looks pretty good!.. I was lucky enough to snag an early take off C8ZF D carb. I noticed on my carb that there were a few markings though not sure what they were other than maybe QC?? Also, my carb had plastic "limiters" on the mixture screws under the front. I would think they would be "concourse" but let's see how others chime in... I can supply pics if needed.

[J_Speegle]

Looks great - really like the body color

A few things I see - based on other original and NOS examples

1- fast idle arm and adjusting screw were zinc not dichromate 

2- Interesting that your choke body is one piece with the threads in plastic. Have normally seen the bonded (epoxied) brass threads

3- The "valve" between the secondary openings on the ones I have were dichromated. It may just be the angle/photo since it looks gold in the side angle

4- Nut on the anti-stall on mine are zinc

5- The secondary stop "arm" (on the passenger side end of the secondary shaft) is dyed red on some  the NOS ones I've got r had








Now you need to find the plastic limiter caps for the idle/bleed screws

[Hipo giddyup]

 Here are some pics of my carburetor. And little dusty and not as clean as Jeff's. 

[J_Speegle]

Here are some pics of my carburetor. And little dusty and not as clean as Jeff's. 

Hard to compete with NOS boxed in 68 - 69   but yours doesn't look bad at all

Got to love the new spring retainer/attachment location   

See it has the same choke cover.

[ruppstang]

The choke cover is a service part. It is hard to find nice originals. Speaking of hard to find anyone have the plastic mixture screw covers?

[Hipo giddyup]

 Yeah, purchased the carb from Ebay years back and never touched it.. I was told it was used on the prior owner's 68 J code only for a few months until it was swapped out for a Holley..

Can't say I have seen caps for sale , and I'm sure they are hard to find as they seemed to have gotten tossed early on. I have a set of blue caps , though not sure why there were white and blue caps??? Either way, always good to have an extra set on hand.

[Bob Gaines]

Yeah, purchased the carb from Ebay years back and never touched it.. I was told it was used on the prior owner's 68 J code only for a few months until it was swapped out for a Holley..

Can't say I have seen caps for sale , and I'm sure they are hard to find as they seemed to have gotten tossed early on. I have a set of blue caps , though not sure why there were white and blue caps??? Either way, always good to have an extra set on hand.

Coincidentally the later Holley replacement caps are blue also . 

[Murf]

The little plastic limiter  replacement caps used to come with rebuild kits when these and other carbs were still only a year or two old.  The color of the cap indicated that it was a replacement and the carb had been apart.  The originals were a whitish or ivory while the replacements were bright colors and I think they would vary in color by carb kit vendor and carb type. 

[midlife]

I remember my father cursing at those caps when he tried to tune up the carb (I was but a wee lad of 15 or so...).  Can someone explain the purpose of these caps?  I suspect they were anti-tamper hardware to keep the carb in emission control from the factory.  However, they are easily removed and re-installed, no?

[J_Speegle]

I remember my father cursing at those caps when he tried to tune up the carb (I was but a wee lad of 15 or so...).  Can someone explain the purpose of these caps?  I suspect they were anti-tamper hardware to keep the carb in emission control from the factory.  However, they are easily removed and re-installed, no?

Pretty much - if you want the official explanation sire its in one of my handbooks or articles

[WT8095]

Excerpts from the 1968 Vehicle Emission Control Systems - Training Handbook 5000. Specifically states that service caps are colored plastic.